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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($)
Total
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss), net [Member]
Balances at Mar. 31, 2014 $ 307,355,321 $ 118,365,503 $ 193,095,944 $ (4,106,126)
Increase (Decrease) in Shareholders' Equity [Roll Forward]        
Proceeds from exercise of stock options, including tax benefits 7,530,624 7,530,624    
Common stock repurchases (115,324,097)   (115,324,097)  
Issuance of restricted common stock under stock option plan 7,834,825 7,834,825    
Stock option expense 8,133,812 8,133,812    
Other comprehensive income (10,796,224)     (10,796,224)
Net income 110,833,458   110,833,458  
Balances at Mar. 31, 2015 315,567,719 141,864,764 188,605,305 (14,902,350)
Increase (Decrease) in Shareholders' Equity [Roll Forward]        
Proceeds from exercise of stock options, including tax benefits 2,575,472 2,575,472    
Issuance of restricted common stock under stock option plan (4,973,005) (4,973,005)    
Stock option expense 1,276,961 1,276,961    
Other comprehensive income (1,823,776)     (1,823,776)
Net income 23,632,051   23,632,051  
Balances at Jun. 30, 2015 $ 336,255,422 $ 140,744,192 $ 212,237,356 $ (16,726,126)