Liabilities / Assets
24th percentile
Higher debt load relative to assets than 24% of similar nonprofits.
Mendham Borough Library
EIN 22-1463449 • 501(c)3 • Mendham, NJ
Profile
The purpose of the library is to provide literary, cultural, and community activities to the public.
Siviq Scores
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
0.00x
Liabilities / Revenue
28th percentile
Higher debt load relative to revenue than 28% of similar nonprofits.
Net Margin
79th percentile
Higher net margin than 79% of similar nonprofits.
Top Officer Pay
Score unavailable
No filing with officer rows is available for this organization yet.
Asset Growth
71st percentile
Faster asset growth than 71% of similar nonprofits.
Revenue Growth
17th percentile
Faster revenue growth than 17% of similar nonprofits.
Balance Sheet
Assets
Up$2,062,109
Up $244,443 (+13%) from 2023
Liabilities
Down$4,273
Down $2,032 (-32%) from 2023
Net Assets
Up$2,057,836
Up $246,475 (+14%) from 2023
Revenue
Down$485,976
Down $93,474 (-16%) from 2023
Expenses
Down$354,695
Down $115,669 (-25%) from 2023
Net Income
Up$131,281
Up $22,195 (+20%) from 2023
Trend Graphs
Filings
Most recent year
2024 • Form 990Facts available. Structured filing facts are available, but richer extracted sections are limited.
- Assets
- $2,062,109
- Liabilities
- $4,273
- Net assets
- $2,057,836
- Revenue
- $485,976
- Expenses
- $354,695
- Net income
- $131,281
Latest Filing Detail
Jump To
Filing Snapshot
- Filing Period
- Jan 1, 2024 to Dec 31, 2024
- Signed
- Nov 14, 2025
- Return Version
- 2024v5.2
- Gross Receipts
- $485,976
Mission and Program Overview
Mission
The purpose of the library is to provide literary, cultural, and community activities to the public by providing various information services such as lending books, magazines, tapes, and internet access.
The purpose of the library is to provide literary, cultural, and community activities to the public.
Balance Sheet Detail
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Investments in Publicly Traded Securities | $1,572,612 | $1,748,866 | ▲ $176,254 |
| Land, Buildings, and Equipment, Net | $19,500 | $176,420 | ▲ $156,920 |
| Savings and Temporary Cash Investments | $118,752 | $69,844 | ▼ $48,908 |
| Cash and Non-Interest-Bearing Accounts | $106,802 | $66,979 | ▼ $39,823 |
| Total Assets | $1,817,666 | $2,062,109 | ▲ $244,443 |
| Liabilities | |||
| Accounts Payable and Accrued Expenses | $6,305 | $4,273 | ▼ $2,032 |
| Total Liabilities | $6,305 | $4,273 | ▼ $2,032 |
| Net Assets / Fund Balance | |||
| Net Assets Without Donor Restrictions | $1,679,743 | $1,921,596 | ▲ $241,853 |
| Net Assets With Donor Restrictions | $131,618 | $136,240 | ▲ $4,622 |
| Total Net Assets Fund Balance | $1,811,361 | $2,057,836 | ▲ $246,475 |
| Total Liabilities and Net Assets / Fund Balance | $1,817,666 | $2,062,109 | ▲ $244,443 |
Asset Categories
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Equipment | $156,920 | - | $156,920 |
| Buildings | $0 | $41,300 | $41,300 |
| Land | $19,500 | - | $19,500 |
Compensation and Service Providers
Employees
| Name | Title | Full / Part Time | Base | Total |
|---|---|---|---|---|
| Trish Hall | Library Director | PT | $66,760 | $66,760 |
Board Members and Trustees
| Name | Title |
|---|---|
| ROSEMAY D'URSO | President |
| Jen Zervigon | Vice President |
| Celeste Moran | Trustee |
| Darius Matousek | Trustee |
| Jane Brooks | Trustee |
| Lynn Eberenz | Trustee |
| Marian Mundy | Trustee |
| Rita Bayer | Trustee |
| Robert Marino | Trustee |
| Liza Russo | Secretary |
| Jacqueline Hinshaw | Treasurer |
Revenue and Support
Revenue Composition
- Contributions and Grants
- $328,323
- Program Service Revenue
- $6,874
- Investment Income
- $150,779
- Other Revenue
- $0
- All Other Contributions
- $113,771
- Change in Net Assets
- $131,281
Expenses and Functional Allocation
Major Expense Lines
| Line Item | Amount |
|---|---|
| Salaries, Compensation, and Employee Benefits | $211,037 |
| Other Expenses | $143,658 |
| Total Fundraising Expense | $12,777 |
| Grants and Similar Amounts Paid | $0 |
| Professional Fundraising Fees | $0 |
Functional Expense Allocation
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $129,262 | $0 | $0 | $129,262 |
| Current Officers, Directors, Trustees, and Key Employees | $66,760 | $0 | $0 | $66,760 |
| Fees for Services Other | $5,790 | $16,769 | $0 | $22,559 |
| Other Expenses | $0 | $15,071 | $0 | $15,071 |
| Payroll Taxes | $15,015 | $0 | $0 | $15,015 |
| Fees for Service Investment Mgmnt Fees | $0 | $13,199 | $0 | $13,199 |
| All Other Expenses | $7,183 | $4,589 | $0 | $11,772 |
| Insurance | $0 | $11,140 | $0 | $11,140 |
| Depreciation Depletion | $0 | $7,680 | $0 | $7,680 |
| Occupancy | $6,341 | $0 | $0 | $6,341 |
| Information Technology | $2,825 | $0 | $0 | $2,825 |
| Total Functional Expenses | $267,110 | $74,808 | $12,777 | $354,695 |
Fundraising, Events, and Gaming
- Fundraising activities
- No
- Gaming activities
- No
- Professional fundraiser used
- No
Fundraising and Gaming Totals
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $0 |
Political and Lobbying Activity
- Political campaign activity
- No
- Lobbying activity
- No
- Subject to proxy tax
- No
Governance and Compliance
Governance Checklist
- Compiled or reviewed by an accountant
- Yes
- Annual disclosure for covered persons
- Yes
- Audit committee
- No
- Business relationship with 35% controlled entity
- No
- Business relationship with family members
- No
- Business relationship with organization members
- No
- Material changes to governing documents
- No
- Compensation from other sources disclosed
- No
- CEO compensation reviewed
- Yes
- Other officer compensation reviewed
- Yes
- Conflict-of-interest policy
- Yes
- Audited financial statements prepared
- No
- Key decisions subject to board approval
- No
- Management duties delegated
- No
Filing and Contact Details
Filer
- Filer Name
- Mendham Borough Library
- EIN
- 22-1463449
- Phone
- 9735434152
- Address
- 10 HILLTOP RD, MENDHAM, NJ 07945
Signing Officer
- Name
- ROSEMARY D'URSO
- Title
- President
- Phone
- 9735434152
- Signed
- 2025-11-14
- Discuss with paid preparer
- Yes
Organization Details
- Principal Officer
- ROSEMARY D'URSO
- Formed
- 1927
- Legal Domicile
- Nj
- Voting Board Members
- 12
- Independent Board Members
- 12
- Employees
- 10
- Volunteers
- 8
Preparer
- Firm
- Wielkotz & Company LLC
- Address
- 401 Wanaque Ave, Pompton Lakes, NJ 07442
- Preparer
- Robert Mcninch
- Phone
- 9738357900
Supplemental Narrative
Additional Explanations
Pt VI, Line 11B
“Mendham borough library has its form 990 prepared by an outside accounting firm and has established the following review process to ensure that the information reported is complete and accurate when the form 990 has been prepared, reviewed by management and is ready to be filed with the internalrevenue service. It is provided to the members of the organizations governing body for any comments prior to its submission, the governing body is provided with a reasonable amount of time to review the form 990. Any comments are then grouped, summarized and provided through management to the outside accounting firm. Any applicable issues are addressed until the return is finalized and approved for filing.”
Pt VI, Line 15A
“The compensation of the organizations officers or key employees is reviewed and approved by the board of trustees, an independent body.”
Pt VI, Line 15B
“The compensation of the organizations officers or key employees is reviewed and approved by the board of trustees, an independent body.”
Pt VI, Line 12C
“Mendham borough library currently has in place a conflict of interest policy which it regularly monitors and enforces. The board mandates that all members of management and the governing body annually sign a conflict of interest policy and disclose any potential or actual conflicts that may exist. If a potential or actual conflict of interest exists, governing body and management will investigate the issue. If a conflict of interest is determined to exist, management and the governing body will be notified immediately. The member will not be allowed to vote or be a part of any decisions about any such transactions that have to do with the conflict until such time that there is no longer a conflict.”
Raw XML AppendixShowing 400 of 449 raw XML fields
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
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| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 4273 |
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| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
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| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 0 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 4589 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 7183 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 11772 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | true |
| IRS990/AuditCommitteeInd | 0 | false |
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| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 9735434152 |
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| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | MENDHAM |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | NJ |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 07945 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | false |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 106802 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 66979 |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 66760 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 66760 |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | true |
| IRS990/CompensationProcessOtherInd | 0 | true |
| IRS990/ConflictOfInterestPolicyInd | 0 | true |
| IRS990/ConservationEasementsInd | 0 | false |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | false |
| IRS990/CreditCounselingInd | 0 | false |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 328323 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 150779 |
| IRS990/CYOtherExpensesAmt | 0 | 143658 |
| IRS990/CYOtherRevenueAmt | 0 | 0 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 6874 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 131281 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 211037 |
| IRS990/CYTotalExpensesAmt | 0 | 354695 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 12777 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 485976 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | false |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | false |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
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| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 7680 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 0 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 7680 |
| IRS990/Desc | 0 | SERVICES PROVIDED BY THE MENDHAM BOROUGH LIBRARY INCLUDE LENDING OF BOOKS, MAGAZINES, AND TAPES. THE LIBRARY PROVIDES ACCESS TO THE INTERNET AND REFERENCE SERVICES, AS WELL AS A VARIETY OF PROGRAMS TO THE COMMUNITY. |
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| IRS990/DisregardedEntityInd | 0 | false |
| IRS990/DocumentRetentionPolicyInd | 0 | true |
| IRS990/DonorAdvisedFundInd | 0 | false |
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| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 136240 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | false |
| IRS990/ElectionOfBoardMembersInd | 0 | false |
| IRS990/EmployeeCnt | 0 | 10 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | true |
| IRS990/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990/ExpenseAmt | 0 | 267110 |
| IRS990/FamilyOrBusinessRlnInd | 0 | false |
| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 16769 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 5790 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 22559 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/FundraisingAmt | 0 | 0 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ManagementAndGeneralAmt | 0 | 13199 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ProgramServicesAmt | 0 | 0 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 13199 |
| IRS990/ForeignActivitiesInd | 0 | false |
| IRS990/ForeignFinancialAccountInd | 0 | false |
| IRS990/ForeignOfficeInd | 0 | false |
| IRS990/Form8282PropertyDisposedOfInd | 0 | false |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 2.00 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 30.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 2.00 |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | JANE BROOKS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | MARIAN MUNDY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | ROBERT MARINO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | DARIUS MATOUSEK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | LYNN EBERENZ |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | CELESTE MORAN |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | ROSEMAY D'URSO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | JEN ZERVIGON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | JACQUELINE HINSHAW |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | LIZA RUSSO |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
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| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | LIBRARY DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | SECRETARY |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/FormationYr | 0 | 1927 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedInd | 0 | false |
| IRS990/FundraisingActivitiesInd | 0 | false |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 12 |
| IRS990/GovernmentGrantsAmt | 0 | 214552 |
| IRS990/GrantAmt | 0 | 6742 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossReceiptsAmt | 0 | 485976 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | true |
| IRS990/IndependentAuditFinclStmtInd | 0 | false |
| IRS990/IndependentVotingMemberCnt | 0 | 12 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InformationTechnologyGrp/FundraisingAmt | 0 | 0 |
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| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 2825 |
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| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 1748866 |
| IRS990/IRPDocumentCnt | 0 | 0 |
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| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 19500 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 176420 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 217720 |
| IRS990/LegalDomicileStateCd | 0 | NJ |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembersOrStockholdersInd | 0 | false |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MissionDesc | 0 | THE PURPOSE OF THE LIBRARY IS TO PROVIDE LITERARY, CULTURAL, AND COMMUNITY ACTIVITIES TO THE PUBLIC. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 1811361 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 2057836 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 1679743 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 1921596 |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 0 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 0 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 6341 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 6341 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherExpensesGrp/Desc | 0 | LIBRARY MATERIAL |
| IRS990/OtherExpensesGrp/Desc | 1 | FACILITIES |
| IRS990/OtherExpensesGrp/Desc | 2 | SUPPLIES |
| IRS990/OtherExpensesGrp/Desc | 3 | REPAIRS |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 12294 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 0 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 2 | 483 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 3 | 0 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 0 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 6360 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 2 | 0 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 3 | 15071 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 24821 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 0 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 9113 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 0 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 37115 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 6360 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 9596 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 15071 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 0 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 0 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 129262 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 129262 |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | false |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 0 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 0 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 15015 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 15015 |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrincipalOfficerNm | 0 | ROSEMARY D'URSO |
| IRS990/PriorPeriodAdjustmentsAmt | 0 | 115194 |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 2 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 3 | 900099 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | YOGA |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | LATE FEES |
| IRS990/ProgramServiceRevenueGrp/Desc | 2 | COPIER AND FAX FEES |
| IRS990/ProgramServiceRevenueGrp/Desc | 3 | BOOK SALES |
| IRS990/ProgramServiceRevenueGrp/ExclusionAmt | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/ExclusionAmt | 1 | 0 |
| IRS990/ProgramServiceRevenueGrp/ExclusionAmt | 2 | 0 |
| IRS990/ProgramServiceRevenueGrp/ExclusionAmt | 3 | 0 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 2633 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 720 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 2 | 1613 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 3 | 1908 |
| IRS990/ProgramServiceRevenueGrp/UnrelatedBusinessRevenueAmt | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/UnrelatedBusinessRevenueAmt | 1 | 0 |
| IRS990/ProgramServiceRevenueGrp/UnrelatedBusinessRevenueAmt | 2 | 0 |
| IRS990/ProgramServiceRevenueGrp/UnrelatedBusinessRevenueAmt | 3 | 0 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYContributionsGrantsAmt | 0 | 524259 |
| IRS990/PYExcessBenefitTransInd | 0 | false |
| IRS990/PYInvestmentIncomeAmt | 0 | 44541 |
| IRS990/PYOtherExpensesAmt | 0 | 258552 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 10650 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 109086 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 211812 |
| IRS990/PYTotalExpensesAmt | 0 | 470364 |
| IRS990/PYTotalRevenueAmt | 0 | 579450 |
| IRS990/QuidProQuoContributionsInd | 0 | false |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | false |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 131281 |
| IRS990/RegularMonitoringEnfrcInd | 0 | true |
| IRS990/RelatedEntityInd | 0 | false |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | false |
| IRS990/ReportInvestmentsOtherSecInd | 0 | false |
| IRS990/ReportLandBuildingEquipmentInd | 0 | true |
| IRS990/ReportOtherAssetsInd | 0 | false |
| IRS990/ReportOtherLiabilitiesInd | 0 | false |
| IRS990/ReportProgramRelatedInvstInd | 0 | false |
| IRS990/RevenueAmt | 0 | 202613 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 118752 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 69844 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearAmt | 0 | 113771 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus1YearAmt | 0 | 304066 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 84094 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 93259 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 57496 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/TotalAmt | 0 | 652686 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl170Grp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearAmt | 0 | 150779 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 44541 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 31125 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 30270 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 29574 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/TotalAmt | 0 | 286289 |
| IRS990ScheduleA/InvestmentIncomeCYPct | 0 | 0 |
| IRS990ScheduleA/OtherIncome170Grp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/OtherSupportSumAmt | 0 | 0 |
| IRS990ScheduleA/PublicOrganization170Ind | 0 | X |
| IRS990ScheduleA/PublicSupportCY170Pct | 0 | 0.85560 |
| IRS990ScheduleA/PublicSupportCY509Pct | 0 | 0 |
| IRS990ScheduleA/PublicSupportPY170Pct | 0 | 0.90710 |
| IRS990ScheduleA/PublicSupportTotal170Amt | 0 | 1696397 |
| IRS990ScheduleA/PublicSupportTotal509Amt | 0 | 0 |
| IRS990ScheduleA/SubstantialContributorsTotAmt | 0 | 0 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft170Grp/CurrentTaxYearAmt | 0 | 214552 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft170Grp/CurrentTaxYearMinus1YearAmt | 0 | 220193 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 216052 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 190187 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 202727 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft170Grp/TotalAmt | 0 | 1043711 |
| IRS990ScheduleA/ThirtyThrPctSuprtTestsCY170Ind | 0 | X |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearAmt | 0 | 328323 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus1YearAmt | 0 | 524259 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 300146 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 283446 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 260223 |
| IRS990ScheduleA/TotalCalendarYear170Grp/TotalAmt | 0 | 1696397 |
| IRS990ScheduleA/TotalSupportAmt | 0 | 1982686 |
| IRS990ScheduleA/UnrelatedBusinessNetIncm170Grp/TotalAmt | 0 | 0 |
| IRS990/ScheduleBRequiredInd | 0 | false |
| IRS990ScheduleD/BuildingsGrp/BookValueAmt | 0 | 0 |
| IRS990ScheduleD/BuildingsGrp/DepreciationAmt | 0 | 41300 |
| IRS990ScheduleD/BuildingsGrp/OtherCostOrOtherBasisAmt | 0 | 41300 |
| IRS990ScheduleD/EquipmentGrp/BookValueAmt | 0 | 156920 |
| IRS990ScheduleD/EquipmentGrp/OtherCostOrOtherBasisAmt | 0 | 156920 |
| IRS990ScheduleD/LandGrp/BookValueAmt | 0 | 19500 |
| IRS990ScheduleD/LandGrp/InvestmentCostOrOtherBasisAmt | 0 | 0 |
| IRS990ScheduleD/LandGrp/OtherCostOrOtherBasisAmt | 0 | 19500 |
| IRS990ScheduleD/TotalBookValueLandBuildingsAmt | 0 | 176420 |
| IRS990/ScheduleJRequiredInd | 0 | false |
| IRS990/ScheduleORequiredInd | 0 | true |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | MENDHAM BOROUGH LIBRARY HAS ITS FORM 990 PREPARED BY AN OUTSIDE ACCOUNTING FIRM AND HAS ESTABLISHED THE FOLLOWING REVIEW PROCESS TO ENSURE THAT THE INFORMATION REPORTED IS COMPLETE AND ACCURATE WHEN THE FORM 990 HAS BEEN PREPARED, REVIEWED BY MANAGEMENT AND IS READY TO BE FILED WITH THE INTERNALREVENUE SERVICE. IT IS PROVIDED TO THE MEMBERS OF THE ORGANIZATIONS GOVERNING BODY FOR ANY COMMENTS PRIOR TO ITS SUBMISSION, THE GOVERNING BODY IS PROVIDED WITH A REASONABLE AMOUNT OF TIME TO REVIEW THE FORM 990. ANY COMMENTS ARE THEN GROUPED, SUMMARIZED AND PROVIDED THROUGH MANAGEMENT TO THE OUTSIDE ACCOUNTING FIRM. ANY APPLICABLE ISSUES ARE ADDRESSED UNTIL THE RETURN IS FINALIZED AND APPROVED FOR FILING. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 1 | THE COMPENSATION OF THE ORGANIZATIONS OFFICERS OR KEY EMPLOYEES IS REVIEWED AND APPROVED BY THE BOARD OF TRUSTEES, AN INDEPENDENT BODY. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 2 | THE COMPENSATION OF THE ORGANIZATIONS OFFICERS OR KEY EMPLOYEES IS REVIEWED AND APPROVED BY THE BOARD OF TRUSTEES, AN INDEPENDENT BODY. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 3 | MENDHAM BOROUGH LIBRARY CURRENTLY HAS IN PLACE A CONFLICT OF INTEREST POLICY WHICH IT REGULARLY MONITORS AND ENFORCES. THE BOARD MANDATES THAT ALL MEMBERS OF MANAGEMENT AND THE GOVERNING BODY ANNUALLY SIGN A CONFLICT OF INTEREST POLICY AND DISCLOSE ANY POTENTIAL OR ACTUAL CONFLICTS THAT MAY EXIST. IF A POTENTIAL OR ACTUAL CONFLICT OF INTEREST EXISTS, GOVERNING BODY AND MANAGEMENT WILL INVESTIGATE THE ISSUE. IF A CONFLICT OF INTEREST IS DETERMINED TO EXIST, MANAGEMENT AND THE GOVERNING BODY WILL BE NOTIFIED IMMEDIATELY. THE MEMBER WILL NOT BE ALLOWED TO VOTE OR BE A PART OF ANY DECISIONS ABOUT ANY SUCH TRANSACTIONS THAT HAVE TO DO WITH THE CONFLICT UNTIL SUCH TIME THAT THERE IS NO LONGER A CONFLICT. |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Pt VI, Line 11b |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | Pt VI, Line 15a |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | Pt VI, Line 15b |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 3 | Pt VI, Line 12c |
| IRS990/SchoolOperatingInd | 0 | false |
| IRS990/SignificantChangeInd | 0 | false |
| IRS990/SignificantNewProgramSrvcInd | 0 | false |
| IRS990/StatesWhereCopyOfReturnIsFldCd | 0 | NJ |
| IRS990/SubjectToProxyTaxInd | 0 | false |
| IRS990/TaxablePartyNotificationInd | 0 | false |
| IRS990/TaxExemptBondsInd | 0 | false |
| IRS990/TerminateOperationsInd | 0 | false |
| IRS990/TotalAssetsBOYAmt | 0 | 1817666 |
| IRS990/TotalAssetsEOYAmt | 0 | 2062109 |
| IRS990/TotalAssetsGrp/BOYAmt | 0 | 1817666 |
| IRS990/TotalAssetsGrp/EOYAmt | 0 | 2062109 |
| IRS990/TotalCompGreaterThan150KInd | 0 | false |
| IRS990/TotalContributionsAmt | 0 | 328323 |
| IRS990/TotalEmployeeCnt | 0 | 10 |
| IRS990/TotalFunctionalExpensesGrp/FundraisingAmt | 0 | 12777 |
| IRS990/TotalFunctionalExpensesGrp/ManagementAndGeneralAmt | 0 | 74808 |
| IRS990/TotalFunctionalExpensesGrp/ProgramServicesAmt | 0 | 267110 |
| IRS990/TotalFunctionalExpensesGrp/TotalAmt | 0 | 354695 |
| IRS990/TotalGrossUBIAmt | 0 | 0 |
| IRS990/TotalLiabilitiesBOYAmt | 0 | 6305 |
| IRS990/TotalLiabilitiesEOYAmt | 0 | 4273 |
| IRS990/TotalLiabilitiesGrp/BOYAmt | 0 | 6305 |
| IRS990/TotalLiabilitiesGrp/EOYAmt | 0 | 4273 |
| IRS990/TotalNetAssetsFundBalanceGrp/BOYAmt | 0 | 1811361 |
| IRS990/TotalNetAssetsFundBalanceGrp/EOYAmt | 0 | 2057836 |
| IRS990/TotalOtherCompensationAmt | 0 | 0 |
| IRS990/TotalProgramServiceExpensesAmt | 0 | 267110 |
| IRS990/TotalProgramServiceRevenueAmt | 0 | 6874 |
| IRS990/TotalReportableCompFromOrgAmt | 0 | 66760 |
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