Cash split to related parties per JV agreement.

No definition available.

Name:	abcp_CashSplit
Namespace Prefix:	abcp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of distributions from equity-based investment.

+ References

No definition available.

+ Details

Name:	abcp_PercentageDistributionsFromEquityBasedInvestment
Namespace Prefix:	abcp_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of Capital Received.

+ References

No definition available.

+ Details

Name:	abcp_PercentageOfCapitalReceived
Namespace Prefix:	abcp_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of cash distribution in proportion to ownership interest in Joint Venture.

+ References

No definition available.

+ Details

Name:	abcp_PercentageOfCashDistributionInProportionToOwnershipInterestInJointVenture
Namespace Prefix:	abcp_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of cash distribution in proportion to ownership interest in Joint Venture upon achieving target.

+ References

No definition available.

+ Details

Name:	abcp_PercentageOfCashDistributionInProportionToOwnershipInterestInJointVentureUponAchievingTarget
Namespace Prefix:	abcp_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the percentage of distribution of company's initial aggregate investment in investment LLC, Joint Venture plus any additional investment.

+ References

No definition available.

+ Details

Name:	abcp_PercentageOfDistributionOfCompanysInitialAggregateInvestment
Namespace Prefix:	abcp_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Pro rata share ratio according to the Joint Venture agreement.

+ References

No definition available.

+ Details

Name:	abcp_ProRataShareRatio
Namespace Prefix:	abcp_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Return of (but not a return on) any additional capital contributions made by the Sponsor on account of manager overruns.

+ References

No definition available.

+ Details

Name:	abcp_ReturnOfAnyAdditionalCapitalContributionsMadeOnAccountOfOverruns
Namespace Prefix:	abcp_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Participation interest assigned to the President and CEO of the company.

+ References

No definition available.

+ Details

Name:	abcp_SubordinatedParticipationInterest
Namespace Prefix:	abcp_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Voting rights in equity method investment.

+ References

No definition available.

+ Details

Name:	abcp_VotingRightsEquityMethodInvestment
Namespace Prefix:	abcp_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Interest expense incurred during the reporting period on subordinated notes and debentures. Includes amortization of expenses incurred in the issuance of subordinated notes and debentures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(8))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

Name:	us-gaap_InterestExpenseSubordinatedNotesAndDebentures
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest payable on debt, including, but not limited to, trade payables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(15)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(15)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

Name:	us-gaap_InterestPayableCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Rate since inception resulting in zero net present value of cash flows from investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 23
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478494/946-205-50-23

+ Details

Name:	us-gaap_InvestmentCompanyInternalRateOfReturnSinceInception
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

+ Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=abcp_MembersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=abcp_SponsorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=abcp_CapitalLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Investment in 111 West 57th Partners LLC (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2025
Investment in 111 West 57th Partners LLC [Abstract]
Internal rate of return	20.00%
Percentage of capital received			150.00%
Cash split	10/90
Mr. R.A. Bianco [Member]
Investment in 111 West 57th Partners LLC [Abstract]
Percentage of distribution of company's initial aggregate investment		150.00%
Members [Member]
Investment in 111 West 57th Partners LLC [Abstract]
Percentage of cash distribution in proportion to ownership interest in Joint Venture upon achieving target	100.00%
Percentage of cash distribution in proportion to ownership interest in Joint Venture	50.00%
Sponsors [Member]
Investment in 111 West 57th Partners LLC [Abstract]
Return of any additional capital contributions made on account of overruns	100.00%
Percentage of cash distribution in proportion to ownership interest in Joint Venture	50.00%
Mr. R.A. Bianco [Member]
Investment in 111 West 57th Partners LLC [Abstract]
Subordinated participation interest		10.00%	10.00%
Voting rights	0.00%
Percentage distributions from equity based investment		10.00%
Interest expense, subordinated participation interest (in Dollars)	$ 0
Interest Payable (in Dollars)	$ 0			$ 179,000
Capital LLC [Member]
Investment in 111 West 57th Partners LLC [Abstract]
Internal rate of return			20.00%
Subordinated participation interest			90.00%
Pro rata share ratio			0.5