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Note 7 - Summary of Operations by Quarter (Details) (USD $)
3 Months Ended 11 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 03, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Revenues $ 11,497us-gaap_Revenues $ 11,147us-gaap_Revenues $ 10,828us-gaap_Revenues $ 9,951us-gaap_Revenues $ 11,026us-gaap_Revenues $ 9,204us-gaap_Revenues $ 9,753us-gaap_Revenues $ 7,693us-gaap_Revenues $ 43,423,000us-gaap_Revenues   $ 37,676,000us-gaap_Revenues $ 31,874,000us-gaap_Revenues
Costs and expenses 11,637us-gaap_SellingGeneralAndAdministrativeExpense 11,410us-gaap_SellingGeneralAndAdministrativeExpense 11,346us-gaap_SellingGeneralAndAdministrativeExpense 11,220us-gaap_SellingGeneralAndAdministrativeExpense 9,521us-gaap_SellingGeneralAndAdministrativeExpense 8,758us-gaap_SellingGeneralAndAdministrativeExpense 8,616us-gaap_SellingGeneralAndAdministrativeExpense 6,992us-gaap_SellingGeneralAndAdministrativeExpense        
Income (Loss) from operations (140)us-gaap_IncomeLossFromContinuingOperations (263)us-gaap_IncomeLossFromContinuingOperations (518)us-gaap_IncomeLossFromContinuingOperations (1,269)us-gaap_IncomeLossFromContinuingOperations 1,505us-gaap_IncomeLossFromContinuingOperations 446us-gaap_IncomeLossFromContinuingOperations 1,137us-gaap_IncomeLossFromContinuingOperations 701us-gaap_IncomeLossFromContinuingOperations   (2,190,000)us-gaap_IncomeLossFromContinuingOperations 3,789,000us-gaap_IncomeLossFromContinuingOperations 8,682,000us-gaap_IncomeLossFromContinuingOperations
Other income 845us-gaap_NonoperatingIncomeExpense 276us-gaap_NonoperatingIncomeExpense 591us-gaap_NonoperatingIncomeExpense 619us-gaap_NonoperatingIncomeExpense 697us-gaap_NonoperatingIncomeExpense 715us-gaap_NonoperatingIncomeExpense 524us-gaap_NonoperatingIncomeExpense 563us-gaap_NonoperatingIncomeExpense        
Pretax income (loss) 705us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 13us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 73us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (650)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 483us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 1,161us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 1,661us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 1,264us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 141,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 141,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 4,569,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 7,901,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Benefit from (provision for) income taxes 475us-gaap_IncomeTaxExpenseBenefit 25us-gaap_IncomeTaxExpenseBenefit (20)us-gaap_IncomeTaxExpenseBenefit 10us-gaap_IncomeTaxExpenseBenefit 485us-gaap_IncomeTaxExpenseBenefit (335)us-gaap_IncomeTaxExpenseBenefit (510)us-gaap_IncomeTaxExpenseBenefit (430)us-gaap_IncomeTaxExpenseBenefit (490,000)us-gaap_IncomeTaxExpenseBenefit (490,000)us-gaap_IncomeTaxExpenseBenefit 790,000us-gaap_IncomeTaxExpenseBenefit 2,360,000us-gaap_IncomeTaxExpenseBenefit
Net income 1,180us-gaap_NetIncomeLoss 38us-gaap_NetIncomeLoss 53us-gaap_NetIncomeLoss (640)us-gaap_NetIncomeLoss 968us-gaap_NetIncomeLoss 826us-gaap_NetIncomeLoss 1,151us-gaap_NetIncomeLoss 834us-gaap_NetIncomeLoss 631,000us-gaap_NetIncomeLoss 631,000us-gaap_NetIncomeLoss 3,779,000us-gaap_NetIncomeLoss 5,541,000us-gaap_NetIncomeLoss
Basic and diluted net income per share (in dollars per share) $ 0.85us-gaap_EarningsPerShareBasicAndDiluted $ 0.03us-gaap_EarningsPerShareBasicAndDiluted $ 0.04us-gaap_EarningsPerShareBasicAndDiluted $ (0.46)us-gaap_EarningsPerShareBasicAndDiluted $ 0.71us-gaap_EarningsPerShareBasicAndDiluted $ 0.60us-gaap_EarningsPerShareBasicAndDiluted $ 0.83us-gaap_EarningsPerShareBasicAndDiluted $ 0.60us-gaap_EarningsPerShareBasicAndDiluted $ 0.46us-gaap_EarningsPerShareBasicAndDiluted   $ 2.74us-gaap_EarningsPerShareBasicAndDiluted $ 4.01us-gaap_EarningsPerShareBasicAndDiluted
Other-than-temporary impairment losses on investments         $ (1,719)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities           $ 1,719,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities $ 2,855,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities