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Consolidated Statements of Shareholders' Equity (USD $)
Common Stock
Accumulated Other Comprehensive Loss
Retained Earnings
Total
Balance at Mar. 31, 2009 $ 18,073,622 $ (755,919) $ 67,700,010 $ 85,017,713
Balance (in shares) at Mar. 31, 2009 11,411,145      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income     10,864,561 10,864,561
Other comprehensive income, net of tax as applicable   577,829   577,829
Issuance of common stock under stock options 269,206     269,206
Issuance of common stock under stock options (in shares) 165,825      
Issuance of restricted share awards, net of forfeitures            
Issuance of restricted share awards, net of forfeitures (in shares) 127,600      
Issuance of performance share awards            
Issuance of performance share awards (in shares) 14,300      
Excess tax benefit on share awards, net 257,600     257,600
Share-based compensation 450,374     450,374
Stock dividend 6,494,018   (6,494,018)  
Balance at Mar. 31, 2010 25,544,820 (178,090) 72,070,553 97,437,283
Balance (in shares) at Mar. 31, 2010 11,718,870      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income     16,805,184 16,805,184
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      
Issuance of restricted share awards, net of forfeitures            
Issuance of restricted share awards, net of forfeitures (in shares) 54,000      
Issuance of performance share awards            
Issuance of 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   88,875,737 115,213,468
Balance (in shares) at Mar. 31, 2011 11,806,660     11,806,660
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income     22,230,292 22,230,292
Issuance of common stock under stock options 830,277     830,277
Issuance of common stock under stock options (in shares) 174,715      
Issuance of restricted share awards, net of forfeitures            
Issuance of restricted share awards, net of forfeitures (in shares) (29,400)      
Issuance of performance share awards            
Issuance of 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
Stock dividend     (3,593,021) (3,593,021)
Balance at Mar. 31, 2012 $ 28,426,043   $ 107,513,008 $ 135,939,051
Balance (in shares) at Mar. 31, 2012 11,960,975     11,960,975