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STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Employee Loans
Retained Earnings
Balance at Mar. 31, 2010 $ 31,197 $ 5,903   $ 25,294
Balance (in shares) at Mar. 31, 2010   3,203,726    
Increase (Decrease) in Stockholders' Equity        
Common stock issued for conversion of stock options net of 15,572, 12,634, and 12,446 shares returned as payment for the years ended March 31, 2013, 2012, and 2011 respectively 196 633 (437)  
Common stock issued for conversion of stock options net of 15,572, 12,634, and 12,446 shares returned as payment for the years ended March 31, 2013, 2012, and 2011 respectively (in shares)   51,432    
Purchase and retirement of common stock (105) (11)   (94)
Purchase and retirement of common stock (in shares)   (4,422)    
Dividends paid (1,488)     (1,488)
Stock-based compensation 383 383    
Tax benefit on exercise of stock options 51     51
Net income 6,183     6,183
Balance at Mar. 31, 2011 36,417 6,908 (437) 29,946
Balance (in shares) at Mar. 31, 2011   3,250,736    
Increase (Decrease) in Stockholders' Equity        
Common stock issued for conversion of stock options net of 15,572, 12,634, and 12,446 shares returned as payment for the years ended March 31, 2013, 2012, and 2011 respectively 1,318 1,277 41  
Common stock issued for conversion of stock options net of 15,572, 12,634, and 12,446 shares returned as payment for the years ended March 31, 2013, 2012, and 2011 respectively (in shares)   88,043    
Purchase and retirement of common stock (597) (60)   (537)
Purchase and retirement of common stock (in shares)   (16,814)    
Dividends paid (1,645)     (1,645)
Stock-based compensation 441 441    
Tax benefit on exercise of stock options 62     62
Net income 7,919     7,919
Balance at Mar. 31, 2012 43,915 8,566 (396) 35,745
Balance (in shares) at Mar. 31, 2012 3,321,965 3,321,965    
Increase (Decrease) in Stockholders' Equity        
Common stock issued for conversion of stock options net of 15,572, 12,634, and 12,446 shares returned as payment for the years ended March 31, 2013, 2012, and 2011 respectively 898 1,101 (203)  
Common stock issued for conversion of stock options net of 15,572, 12,634, and 12,446 shares returned as payment for the years ended March 31, 2013, 2012, and 2011 respectively (in shares)   77,753    
Purchase and retirement of common stock (102) (56) 450 (496)
Purchase and retirement of common stock (in shares)   (11,170)    
Dividends paid (1,815)     (1,815)
Stock-based compensation 1,112 1,112    
Tax benefit on exercise of stock options 295     295
Net income 8,450     8,450
Balance at Mar. 31, 2013 $ 52,753 $ 10,723 $ (149) $ 42,179
Balance (in shares) at Mar. 31, 2013 3,388,548 3,388,548