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Share-Based Compensation: (Details) (USD $)
 12 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2013
item
Sep. 30, 2012
Sep. 30, 2011
Jan. 25, 2013
Options
Mar. 31, 2013
Options
Sep. 30, 2013
Options
Sep. 30, 2013
1998 Plan
Sep. 30, 2012
1998 Plan
Sep. 30, 2011
1998 Plan
Sep. 30, 2013
1998 Plan
Options
Sep. 30, 2012
1998 Plan
Options
Sep. 30, 2011
1998 Plan
Options
Sep. 30, 2013
2009 Plan
Sep. 30, 2012
2009 Plan
Sep. 30, 2011
2009 Plan
Sep. 30, 2013
2009 Plan
Options
Sep. 30, 2012
2009 Plan
Options
Sep. 30, 2011
2009 Plan
Options
Mar. 31, 2013
2009 Plan
Options
Sep. 30, 2013
2009 Plan
Performance-based Award
Employees
Share-based compensation                                        
Share-based compensation expense $ 912,000 $ 645,000 $ 371,000   $ 22,000   $ 34,000 $ 67,000 $ 117,000       $ 678,000 $ 377,000 $ 54,000          
Unrecognized compensation cost, related to non-vested stock options           59,000       0           1,118,000     59,000  
Excess (shortfall) in income tax benefits related to share-based compensation arrangements (33,000) (5,000) 7,000                                  
Reduction in applicable option exercise price of each outstanding option (in dollars per share)       $ 1.50                                
Number of share-based compensation plans maintained by the company 3                                      
Number of shares of common stock reserved for awards             3,389,000           1,200,000              
Maximum award (in shares)                                       300,000
Number of shares of common stock available for awards under the plan                         358,785              
Options                                        
Outstanding at the beginning of the period (in shares) 836,200                 376,200 387,800 491,200       460,000 230,000 50,000    
Granted (in shares)                   0 0 0       250,000 280,000 180,000    
Exercised (in shares)                   (226,800) 0         (27,999)        
Cancelled (in shares)                   (4,900) (11,600) (103,400)       (1,667) (50,000)      
Outstanding at the end of the period (in shares) 824,834 836,200               144,500 376,200 387,800       680,334 460,000 230,000    
Vested and expected to vest (in shares)                   144,500           680,334        
Options exercisable at the end of the period (in shares)                   144,500           175,331        
Weighted Average Exercise Price                                        
Outstanding at the beginning of the period (in dollars per share)                   $ 8.62 $ 8.74 $ 9.21       $ 4.45 $ 5.11 $ 4.50    
Granted (in dollars per share)                               $ 4.06 $ 3.92 $ 5.28    
Exercised (in dollars per share)                   $ 4.63           $ 3.78        
Cancelled (in dollars per share)                   $ 11.42 $ 12.65 $ 10.95       $ 3.78 $ 4.50      
Outstanding at the end of the period (in dollars per share)                   $ 12.79 $ 8.62 $ 8.74       $ 3.32 $ 4.45 $ 5.11    
Vested and expected to vest (in dollars per share)                   $ 12.79           $ 3.32        
Options exercisable at the end of the period (in dollars per share)                   $ 12.79           $ 3.16        
Aggregate Intrinsic Value                                        
Exercised (in dollars)                   174,112           118,802        
Outstanding at the end of the period (in dollars)                               3,153,696        
Vested and expected to vest (in dollars)                               3,153,696        
Options exercisable at the end of the period (in dollars)                               $ 841,216        
Weighted-average grant date fair value (in dollars per share)                   $ 0.00 $ 0.00                  
Intrinsic value of options granted (in dollars per share)                   $ 0 $ 0