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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, 2016 $ 391,901,581 $ 138,835,064 $ 276,000,862 $ (22,934,345)
Increase (Decrease) in Shareholders' Equity [Roll Forward]        
Proceeds from exercise of stock options, including tax benefits 595,343 595,343    
Stock Repurchased During Period, Value 4,995,809   4,995,809  
Issuance of restricted common stock under stock option plan 1,320,036 1,320,036    
Stock option expense 3,490,662 3,490,662    
Other comprehensive income (4,848,530)     (4,848,530)
Net income 73,600,294   73,600,294  
Balances at Mar. 31, 2017 461,063,577 144,241,105 344,605,347 (27,782,875)
Increase (Decrease) in Shareholders' Equity [Roll Forward]        
Proceeds from exercise of stock options, including tax benefits 6,765,046 6,765,046    
Stock Repurchased and Retired During Period, Value     4,614,331  
Issuance of restricted common stock under stock option plan 1,290,118 1,290,118    
Stock option expense 1,122,227 1,122,227    
Other comprehensive income 1,658,641     1,658,641
Net income 22,867,031   22,867,031  
Balances at Sep. 30, 2017 490,152,309 $ 155,823,825 $ 360,452,718 $ (26,124,234)
Increase (Decrease) in Shareholders' Equity [Roll Forward]        
Cumulative Effect of New Accounting Principle in Period of Adoption $ (2,405,329)