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Income Taxes (Schedule of Income Tax Effects of Changes in Temporary Differences) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
Deferred policy acquisition costs $ (2)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesDeferredPolicyAcquisitionCosts $ (14)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesDeferredPolicyAcquisitionCosts
Unearned premiums (48)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesUnearnedPremiums (76)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesUnearnedPremiums
General expenses (44)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesGeneralExpenses (5)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesGeneralExpenses
Depreciation (4)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesDepreciation (42)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesDepreciation
Claims liabilities (14)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesClaimLiabilities (42)nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesClaimLiabilities
AMT credit 119nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesAmtCredit 0nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesAmtCredit
NOL carryforward 0nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesNolCarryforward 375nsec_IncomeTaxEffectsOfChangesInTemporaryDifferencesNolCarryforward
Deferred income tax expense $ 7us-gaap_DeferredIncomeTaxExpenseBenefit $ 196us-gaap_DeferredIncomeTaxExpenseBenefit