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Investments - Unrealized appreciation on investments (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Notes to Financial Statements    
Gross unrealized appreciation of fixed maturities $ 14,476us-gaap_TaxBasisOfInvestmentsGrossUnrealizedAppreciation $ 0us-gaap_TaxBasisOfInvestmentsGrossUnrealizedAppreciation
Gross unrealized (depreciation) of fixed maturities (9,031)us-gaap_TaxBasisOfInvestmentsGrossUnrealizedDepreciation (8,757)us-gaap_TaxBasisOfInvestmentsGrossUnrealizedDepreciation
Net unrealized appreciation (depreciation) on investments 5,445UNAM_NetUnrealizedAppreciationDepreciationOnInvestments (8,757)UNAM_NetUnrealizedAppreciationDepreciationOnInvestments
Deferred federal tax expense (1,851)us-gaap_DeferredTaxLiabilitiesDeferredExpense 2,977us-gaap_DeferredTaxLiabilitiesDeferredExpense
Net unrealized appreciation (depreciation), net of deferred income taxes $ 3,594UNAM_NetUnrealizedAppreciationDepreciationNetOfTax $ (5,780)UNAM_NetUnrealizedAppreciationDepreciationNetOfTax