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Net Income (Loss) Per Share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net Income (Loss) Per Share [Abstract]        
Net income (loss) $ 9,143,000 $ (1,392,000) $ 16,651,000 $ 518,000
Basic shares (in shares) 18,641,324 18,215,783 18,544,118 18,109,912
Effect of potentially dilutive securities (in shares) 788,066 0 840,550 777,241
Diluted shares (in shares) 19,429,390 18,215,783 19,384,668 18,887,153
Net income (loss) per share [Abstract]        
Basic net income (loss) per share (in dollars per share) $ 0.49 $ (0.08) $ 0.90 $ 0.03
Diluted net income (loss) per share (in dollars per share) $ 0.47 $ (0.08) $ 0.86 $ 0.03
Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive shares excluded from computation of earnings per share (in shares) 291,215 1,204,619 108,815 110,122
Exercise price of options, lower range (in dollars per share) $ 28.68 $ 4.17 $ 30.91 $ 31.10
Exercise price of options, upper range (in dollars per share) $ 34.17 $ 31.13 $ 34.17 31.13
Warrants [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive shares excluded from computation of earnings per share (in shares)   516,129    
Exercise price of options (in dollars per share)   $ 7.75   $ 7.75