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Consolidated Statements of Shareholders' Equity (USD $)
Common Stock
Accumulated Other Comprehensive Loss
Retained Earnings
Total
Balance at Mar. 31, 2010 $ 25,544,820 $ (178,090) $ 71,440,086 $ 96,806,816
Balance (in shares) at Mar. 31, 2010 11,718,870      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income     16,768,294 16,768,294
Other comprehensive income, net of tax as applicable   178,090   178,090
Issuance of common stock under stock options 55,610     55,610
Issuance of common stock under stock options (in shares) 26,090      
Grants of restricted share awards, net of forfeitures (in shares) 54,000      
Vested performance share awards (in shares) 7,700      
Excess tax benefit on share awards, net 76,973     76,973
Share-based compensation 660,328     660,328
Balance at Mar. 31, 2011 26,337,731   88,208,380 114,546,111
Balance (in shares) at Mar. 31, 2011 11,806,660      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income     22,221,759 22,221,759
Issuance of common stock under stock options 830,277     830,277
Issuance of common stock under stock options (in shares) 174,715      
Grants of restricted share awards, net of forfeitures (in shares) (29,400)      
Vested performance share awards (in shares) 9,000      
Excess tax benefit on share awards, net 706,123     706,123
Share-based compensation 551,912     551,912
Cash dividend     (3,593,021) (3,593,021)
Balance at Mar. 31, 2012 28,426,043   106,837,118 135,263,161
Balance (in shares) at Mar. 31, 2012 11,960,975      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income     19,940,946 19,940,946
Issuance of common stock under stock options 612,465     612,465
Issuance of common stock under stock options (in shares) 97,594      
Grants of restricted share awards, net of forfeitures (in shares) 85,000      
Vested performance share awards (in shares) 10,500      
Excess tax benefit on share awards, net 181,036     181,036
Share-based compensation 812,004     812,004
Cash dividend     (29,844,516) (29,844,516)
Balance at Mar. 31, 2013 $ 30,031,548   $ 96,933,548 $ 126,965,096
Balance (in shares) at Mar. 31, 2013 12,154,069