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Income Taxes (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Components of income tax expense (benefit) [Abstract]      
Federal - current $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ 238,000us-gaap_CurrentFederalTaxExpenseBenefit  
State - current 30,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 412,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit  
Total current 30,000us-gaap_CurrentIncomeTaxExpenseBenefit 650,000us-gaap_CurrentIncomeTaxExpenseBenefit  
Federal - deferred (370,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (457,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit  
State - deferred 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit  
Change in valuation allowance 370,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 457,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance  
Total deferred 0us-gaap_DeferredIncomeTaxExpenseBenefit 0us-gaap_DeferredIncomeTaxExpenseBenefit  
Income tax expense (benefit) 30,000us-gaap_IncomeTaxExpenseBenefit 650,000us-gaap_IncomeTaxExpenseBenefit  
Components of pretax income (loss) and difference between income taxes [Abstract]      
Income (loss) before income taxes (1,056,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (1,305,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest  
Tax expense (benefit) [Abstract]      
Tax at statutory federal rate (370,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate (457,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate  
State income taxes 30,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 55,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes  
Federal interest 0abcp_EffectiveIncomeTaxRateReconciliationFederalTaxesInterestAmountAccrued 238,000abcp_EffectiveIncomeTaxRateReconciliationFederalTaxesInterestAmountAccrued  
State interest 0abcp_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesInterestAmountAccrued 357,000abcp_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesInterestAmountAccrued  
Permanent items 0abcp_IncomeTaxReconciliationPermanentItems 0abcp_IncomeTaxReconciliationPermanentItems  
Other 0us-gaap_IncomeTaxReconciliationOtherAdjustments 0us-gaap_IncomeTaxReconciliationOtherAdjustments  
Change in valuation allowance 370,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 457,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance  
Income tax expense (benefit) 30,000us-gaap_IncomeTaxExpenseBenefit 650,000us-gaap_IncomeTaxExpenseBenefit  
Reconciliation of federal statutory rate to effective income tax rate [Abstract]      
Tax at statutory federal rate (in hundredths) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
State income taxes (in hundredths) (2.80%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (4.20%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes  
Federal interest (in hundredths) 0.00%abcp_EffectiveIncomeTaxRateReconciliationFederalInterest (18.20%)abcp_EffectiveIncomeTaxRateReconciliationFederalInterest  
State interest (in hundredths) 0.00%abcp_EffectiveIncomeTaxRateReconciliationStateInterest (27.40%)abcp_EffectiveIncomeTaxRateReconciliationStateInterest  
Permanent differences, tax credits and other adjustments (in hundredths) 0.00%abcp_EffectiveIncomeTaxRateReconciliationPermanentDifferencesTaxCreditsAndOtherAdjustments 0.00%abcp_EffectiveIncomeTaxRateReconciliationPermanentDifferencesTaxCreditsAndOtherAdjustments  
Other (in hundredths) 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments  
Change in valuation allowance (in hundredths) (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance  
Effective income tax rate (in hundredths) (2.80%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (49.80%)us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Roll Forward of Uncertain Tax Positions Reserve, Excluding Accrued Federal and State Interest [Abstract]      
Uncertain tax position reserve excluding accrued interest, at beginning of period 0us-gaap_UnrecognizedTaxBenefits 34,157,000us-gaap_UnrecognizedTaxBenefits 34,157,000us-gaap_UnrecognizedTaxBenefits
Federal uncertain tax position reserve excluding accrued interest 0abcp_FederalUncertainTaxPositionReserveExcludingAccruedInterest   (18,429,000)abcp_FederalUncertainTaxPositionReserveExcludingAccruedInterest
State uncertain tax position reserve excluding accrued interest 0abcp_StateUncertainTaxPositionReserveExcludingAccruedInterest   (15,728,000)abcp_StateUncertainTaxPositionReserveExcludingAccruedInterest
Uncertain tax position reserve excluding accrued interest, at end of period 0us-gaap_UnrecognizedTaxBenefits   0us-gaap_UnrecognizedTaxBenefits
Interest expense related to uncertain tax positions [Abstract]      
Federal 0abcp_IncomeTaxInterestExpenseFederal 238,000abcp_IncomeTaxInterestExpenseFederal  
State jurisdictions 0abcp_IncomeTaxInterestExpenseState 357,000abcp_IncomeTaxInterestExpenseState  
Interest expense - taxes 0us-gaap_IncomeTaxExaminationInterestExpense 595,000us-gaap_IncomeTaxExaminationInterestExpense  
Operating Loss Carryforwards [Line Items]      
AMT Credits 21,000,000us-gaap_TaxCreditCarryforwardAmount    
Calculated Net Deferred Tax Asset Arising Primarily From NOL Carryforwards [Abstract]      
Net deferred tax asset 32,900,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards   32,900,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Valuation allowance (32,900,000)us-gaap_OperatingLossCarryforwardsValuationAllowance   (32,900,000)us-gaap_OperatingLossCarryforwardsValuationAllowance
Net deferred tax asset recognized 0us-gaap_TaxCreditCarryforwardDeferredTaxAsset   0us-gaap_TaxCreditCarryforwardDeferredTaxAsset
Federal [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards, amount 32,600,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
   
State [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards, amount 10,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
   
First Originated Loss Carryforwards [Member] | Federal [Member] | Tax Year 2006 [Member]      
Operating Loss Carryforwards [Line Items]      
Tax year originating 2006    
Tax year expiring 2026    
Operating loss carryforwards, amount 500,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ abcp_NetOperatingLossCarryforwardsAxis
= abcp_FirstOriginatedLossCarryforwardsMember
/ abcp_TaxPeriodAxis
= abcp_TaxYear2006Member
   
First Originated Loss Carryforwards [Member] | Federal [Member] | Tax Year 2007 [Member]      
Operating Loss Carryforwards [Line Items]      
Tax year originating 2007    
Tax year expiring 2027    
Operating loss carryforwards, amount 12,700,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ abcp_NetOperatingLossCarryforwardsAxis
= abcp_FirstOriginatedLossCarryforwardsMember
/ abcp_TaxPeriodAxis
= abcp_TaxYear2007Member
   
First Originated Loss Carryforwards [Member] | Federal [Member] | Tax Year 2008 [Member]      
Operating Loss Carryforwards [Line Items]      
Tax year originating 2008    
Tax year expiring 2028    
Operating loss carryforwards, amount 4,600,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ abcp_NetOperatingLossCarryforwardsAxis
= abcp_FirstOriginatedLossCarryforwardsMember
/ abcp_TaxPeriodAxis
= abcp_TaxYear2008Member
   
First Originated Loss Carryforwards [Member] | Federal [Member] | Tax Year 2009 [Member]      
Operating Loss Carryforwards [Line Items]      
Tax year originating 2009    
Tax year expiring 2029    
Operating loss carryforwards, amount 2,400,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ abcp_NetOperatingLossCarryforwardsAxis
= abcp_FirstOriginatedLossCarryforwardsMember
/ abcp_TaxPeriodAxis
= abcp_TaxYear2009Member
   
First Originated Loss Carryforwards [Member] | Federal [Member] | Tax Year 2010 [Member]      
Operating Loss Carryforwards [Line Items]      
Tax year originating 2010    
Tax year expiring 2030    
Operating loss carryforwards, amount 1,900,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ abcp_NetOperatingLossCarryforwardsAxis
= abcp_FirstOriginatedLossCarryforwardsMember
/ abcp_TaxPeriodAxis
= abcp_TaxYear2010Member
   
First Originated Loss Carryforwards [Member] | Federal [Member] | Tax Year 2011 [Member]      
Operating Loss Carryforwards [Line Items]      
Tax year originating 2011    
Tax year expiring 2031    
Operating loss carryforwards, amount 1,900,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ abcp_NetOperatingLossCarryforwardsAxis
= abcp_FirstOriginatedLossCarryforwardsMember
/ abcp_TaxPeriodAxis
= abcp_TaxYear2011Member
   
First Originated Loss Carryforwards [Member] | Federal [Member] | Tax Year 2013 [Member]      
Operating Loss Carryforwards [Line Items]      
Tax year originating 2013    
Tax year expiring 2033    
Operating loss carryforwards, amount 3,700,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ abcp_NetOperatingLossCarryforwardsAxis
= abcp_FirstOriginatedLossCarryforwardsMember
/ abcp_TaxPeriodAxis
= abcp_TaxYear2013Member
   
First Originated Loss Carryforwards [Member] | State [Member]      
Operating Loss Carryforwards [Line Items]      
Tax year originating 2011    
Tax year expiring 2031    
Operating loss carryforwards, amount 1,900,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ abcp_NetOperatingLossCarryforwardsAxis
= abcp_FirstOriginatedLossCarryforwardsMember
   
Second Originated Loss Carryforward [Member] | Federal [Member]      
Operating Loss Carryforwards [Line Items]      
Tax year originating 2014    
Second Originated Loss Carryforward [Member] | Federal [Member] | Tax Year 2014 [Member]      
Operating Loss Carryforwards [Line Items]      
Tax year expiring 2034    
Operating loss carryforwards, amount 4,900,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ abcp_NetOperatingLossCarryforwardsAxis
= abcp_SecondOriginatedLossCarryforwardMember
/ abcp_TaxPeriodAxis
= abcp_TaxYear2014Member
   
Second Originated Loss Carryforward [Member] | State [Member]      
Operating Loss Carryforwards [Line Items]      
Tax year originating 2013    
Tax year expiring 2033    
Operating loss carryforwards, amount 3,400,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ abcp_NetOperatingLossCarryforwardsAxis
= abcp_SecondOriginatedLossCarryforwardMember
   
Third Originated Loss Carryforward [Member] | State [Member]      
Operating Loss Carryforwards [Line Items]      
Tax year originating 2014    
Tax year expiring 2034    
Operating loss carryforwards, amount $ 4,700,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ abcp_NetOperatingLossCarryforwardsAxis
= abcp_ThirdOriginatedLossCarryforwardMember