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Income Taxes (Schedule of Income Tax Effects of Changes in Temporary Differences) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Deferred policy acquisition costs $ (63)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesDeferredPolicyAcquisitionCosts $ (109)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesDeferredPolicyAcquisitionCosts
Other-than-temporary impairments 0nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesOtti 164nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesOtti
Income Tax Effects Of Changes In Temporary Differences Real Estate Impairment (187)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesRealEstateImpairment 0nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesRealEstateImpairment
Trading securities 0nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesTradingSecurities (1)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesTradingSecurities
Unearned premiums (106)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesUnearnedPremiums (104)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesUnearnedPremiums
General expenses (45)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesGeneralExpenses (115)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesGeneralExpenses
Depreciation (8)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesDepreciation 25nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesDepreciation
Claims liabilities (149)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesClaimLiabilities (457)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesClaimLiabilities
Litigation settlement 1,133nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesLitigationSettlement 397nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesLitigationSettlement
AMT credit (905)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesAmtCredit (89)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesAmtCredit
NOL carryforward 849nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesNolCarryforward 1,862nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesNolCarryforward
Deferred income tax expense $ 519us-gaap_DeferredIncomeTaxExpenseBenefit $ 1,573us-gaap_DeferredIncomeTaxExpenseBenefit