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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Income Taxes [Line Items]      
Computed expected tax expense $ 5,750us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ 5,037us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ 4,108us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State income taxes, net of federal benefit 242us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 146us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 140us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Stock-based compensation and other permanent differences (76)us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEmployeeStockOptions 231us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEmployeeStockOptions 44us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEmployeeStockOptions
Total income tax expense $ 5,916us-gaap_IncomeTaxExpenseBenefit $ 5,414us-gaap_IncomeTaxExpenseBenefit $ 4,292us-gaap_IncomeTaxExpenseBenefit