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Consolidated Statements of Shareholders' Equity (USD $)
Common Stock
Retained Earnings
Total
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       
Grants of restricted share awards, net of forfeitures (in shares) (29,400)    
Vested performance share awards       
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       
Grants of restricted share awards, net of forfeitures (in shares) 85,000    
Vested performance share awards       
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    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income   16,703,352 16,703,352
Issuance of common stock under stock options 328,913   328,913
Issuance of common stock under stock options (in shares) 66,805    
Excess tax benefit on share awards, net 256,250   256,250
Share-based compensation 535,070   535,070
Cash dividend   (2,851,126) (2,851,126)
Balance at Mar. 31, 2014 $ 31,151,781 $ 110,785,774 $ 141,937,555
Balance (in shares) at Mar. 31, 2014 12,220,874