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Net Income Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Income Per Share [Abstract]
Net income	$ 6,301,000	$ 9,143,000	$ 13,927,000	$ 16,651,000
Basic shares (in shares)	18,718,709	18,641,324	18,687,179	18,544,118
Effect of potentially dilutive securities (in shares)	638,100	788,066	683,965	840,550
Diluted shares (in shares)	19,356,809	19,429,390	19,371,144	19,384,668
Net income per share [Abstract]
Basic net income per share (in dollars per share)	$ 0.34	$ 0.49	$ 0.75	$ 0.90
Diluted net income per share (in dollars per share)	$ 0.33	$ 0.47	$ 0.72	$ 0.86
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of earnings per share (in shares)	455,339	291,215	292,239	108,815
Exercise price of options, lower range (in dollars per share)	$ 27.40	$ 28.68	$ 28.68	$ 30.91
Exercise price of options, upper range (in dollars per share)	$ 34.17	$ 34.17	$ 34.17	$ 34.17

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