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Share-Based Compensation: (Details 2) (USD $)
 12 Months Ended
Sep. 30, 2013
1998 Plan | Options
  
Information about stock options, by exercise price range  
Options outstanding at the end of the period (in shares) 144,500
Options Outstanding - Weighted-Average Remaining Contractual Life 2 years 3 months 18 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 12.79
Options exercisable at the end of the period (in shares) 144,500
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 12.79
1998 Plan | Range of Exercise Price - $0.00 - $5.00 | Options
  
Information about stock options, by exercise price range  
Exercise price, low end of range (in dollars per share) $ 0.00
Exercise price, high end of range (in dollars per share) $ 5.00
Options outstanding at the end of the period (in shares) 12,000
Options Outstanding - Weighted-Average Remaining Contractual Life 1 day
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 3.913
Options exercisable at the end of the period (in shares) 12,000
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 3.913
1998 Plan | Range of Exercise Price - $5.01 - $10.00 | Options
  
Information about stock options, by exercise price range  
Exercise price, low end of range (in dollars per share) $ 5.01
Exercise price, high end of range (in dollars per share) $ 10.00
Options outstanding at the end of the period (in shares) 45,000
Options Outstanding - Weighted-Average Remaining Contractual Life 3 years 23 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 6.728
Options exercisable at the end of the period (in shares) 45,000
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 6.728
1998 Plan | Range of Exercise Price - $10.01 - $15.00 | Options
  
Information about stock options, by exercise price range  
Exercise price, low end of range (in dollars per share) $ 10.01
Exercise price, high end of range (in dollars per share) $ 15.00
Options outstanding at the end of the period (in shares) 51,000
Options Outstanding - Weighted-Average Remaining Contractual Life 1 year 6 months 26 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 12.587
Options exercisable at the end of the period (in shares) 51,000
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 12.587
1998 Plan | Range of Exercise Price - $15.01 - $20.00 | Options
  
Information about stock options, by exercise price range  
Exercise price, low end of range (in dollars per share) $ 15.01
Exercise price, high end of range (in dollars per share) $ 20.00
Options outstanding at the end of the period (in shares) 4,500
Options Outstanding - Weighted-Average Remaining Contractual Life 1 year 1 month 25 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 17.822
Options exercisable at the end of the period (in shares) 4,500
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 17.822
1998 Plan | Range of Exercise Price - $20.01 - $25.00
  
Information about stock options, by exercise price range  
Exercise price, low end of range (in dollars per share) $ 20.01
Exercise price, high end of range (in dollars per share) $ 25.00
Options outstanding at the end of the period (in shares) 32,000
Options Outstanding - Weighted-Average Remaining Contractual Life 3 years 4 months 29 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 24.272
Options exercisable at the end of the period (in shares) 32,000
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 24.272
2009 Plan | Range of Exercise Price - $0.00 - $5.00 | Options
  
Information about stock options, by exercise price range  
Exercise price, low end of range (in dollars per share) $ 0.00
Exercise price, high end of range (in dollars per share) $ 5.00
Options outstanding at the end of the period (in shares) 680,334
Options Outstanding - Weighted-Average Remaining Contractual Life 8 years 7 months 6 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 3.32
Options exercisable at the end of the period (in shares) 175,331
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 3.16