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Net Income Per Share (Details) - USD ($)
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Net Income Per Share [Abstract]    
Net income $ 7,626,000 $ 7,508,000
Basic shares (in shares) 18,655,304 18,545,621
Effect of potentially dilutive securities (in shares) 766,048 939,317
Diluted shares (in shares) 19,421,352 19,484,938
Net income per share [Abstract]    
Basic net income per share (in dollars per share) $ 0.41 $ 0.40
Diluted net income per share (in dollars per share) $ 0.39 $ 0.39
Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive shares excluded from computation of earnings per share (in shares) 111,172 1,100
Exercise price of options, lower range (in dollars per share) $ 30.31 $ 34.17
Exercise price of options, upper range (in dollars per share) $ 34.17