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Note 3 - Deferred Income Taxes (Details) (USD $)
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Deferred tax assets attributable to:      
Accrued liabilities, including supplemental compensation and vacation pay accrual $ 1,063,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits $ 1,083,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits $ 1,817,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Impairment losses on investments 1,779,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses 1,778,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses 1,135,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses
Bad debt reserves not yet deductible 78,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 78,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 80,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Depreciation and amortization 1,822,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 356,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 49,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred revenues (1,116,000)us-gaap_DeferredTaxAssetsDeferredIncome    
Other 12,000us-gaap_DeferredTaxAssetsOther 41,000us-gaap_DeferredTaxAssetsOther 262,000us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 5,870,000us-gaap_DeferredTaxAssetsGross 3,336,000us-gaap_DeferredTaxAssetsGross 3,343,000us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities attributable to:      
Unrealized gains on investments (48,896,000)us-gaap_DeferredTaxLiabilitiesInvestments (34,610,000)us-gaap_DeferredTaxLiabilitiesInvestments (20,898,000)us-gaap_DeferredTaxLiabilitiesInvestments
Goodwill (495,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill    
Total deferred tax liabilities (49,391,000)us-gaap_DeferredIncomeTaxLiabilities (34,610,000)us-gaap_DeferredIncomeTaxLiabilities (20,898,000)us-gaap_DeferredIncomeTaxLiabilities
Net deferred income taxes $ (43,521,000)us-gaap_DeferredTaxLiabilities $ (31,274,000)us-gaap_DeferredTaxLiabilities $ (17,555,000)us-gaap_DeferredTaxLiabilities