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Income Taxes: (Details 4) (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Tax credit carryforward      
Unrecognized tax benefits $ 492,000 $ 403,000 $ 491,000
Decrease in valuation allowance 16,000    
Reconciliation of beginning and ending balances of total amounts of gross unrecognized tax benefits      
Balance at beginning of year 403,000 491,000 425,000
Unrecognized tax benefits related to current year 120,000 12,000 67,000
Decrease in unrecognized tax benefits due to the lapse of applicable statute of limitations (31,000) (100,000) (1,000)
Balance at end of year 492,000 403,000 491,000
Unrecognized tax benefits , if recognized, would impact effective tax rate 492,000 403,000 491,000
Interest accrued, net of tax benefits 1,000 4,000  
Accrual recorded for penalties 0 0  
Expense (benefit) for interest (net of federal impact) recognized (3,000) (8,000) 4,000
Adjustments resulting from IRS examination   0  
Other Liabilities
      
Tax credit carryforward      
Unrecognized tax benefits 10,000 92,000  
Reconciliation of beginning and ending balances of total amounts of gross unrecognized tax benefits      
Balance at end of year 10,000 92,000  
R&D | Federal
      
Tax credit carryforward      
Tax Credit carryforwards 690,000    
Reversal in valuation allowance   2,400,000  
R&D | State
      
Tax credit carryforward      
Tax Credit carryforwards $ 208,000