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Quarterly Financial Data (Unaudited)
12 Months Ended
Sep. 30, 2011
Quarterly Financial Data (Unaudited) [Abstract] 
Quarterly Financial Data (Unaudited)
(11) Quarterly Financial Data (Unaudited)
The sum of the earnings per common share and cash dividends per share may not equal the corresponding annual amounts due to interim quarter rounding.
                                 
For the Quarter Ended in Fiscal 2011   December 31     March 31     June 30     September 30  
 
                               
 
                               
Net sales
  $ 37,263     $ 41,059     $ 40,052     $ 41,349  
Gross profit
    23,502       25,957       25,351       24,488  
Net earnings
    6,025       7,260       6,836       6,710  
Basic earnings per common share
    0.15       0.18       0.17       0.16  
Diluted earnings per common share
    0.15       0.18       0.17       0.16  
Cash dividends per common share
    0.19       0.19       0.19       0.19  
                                 
For the Quarter Ended in Fiscal 2010   December 31     March 31     June 30     September 30  
 
                               
Net sales
  $ 42,457     $ 31,147     $ 33,857     $ 35,539  
Gross profit
    25,404       20,222       21,803       21,267  
Net earnings
    8,921       5,980       6,424       5,322  
Basic earnings per common share
    0.22       0.15       0.16       0.13  
Diluted earnings per common share
    0.22       0.15       0.16       0.13  
Cash dividends per common share
    0.17       0.19       0.19       0.19