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Net Income (Loss) Per Share (Details) - USD ($)	3 Months Ended			6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reconciliation of basic and diluted net income (loss) per share [Abstract]
Net income (loss)	$ 3,513,000	$ 5,595,000	$ 7,820,000	$ (1,982,000)	$ 13,415,000
Basic shares (in shares)	18,878,674	18,718,709		18,887,214	18,687,179
Effect of potentially dilutive securities (in shares)	440,791	638,100		0	683,965
Diluted shares (in shares)	19,319,465	19,356,809		18,887,214	19,371,144
Net income (loss) per share [Abstract]
Basic net income (loss) per share (in dollars per share)	$ 0.19	$ 0.30	$ 0.42	$ (0.10)	$ 0.72
Diluted net income (loss) per share (in dollars per share)	$ 0.18	$ 0.29	$ 0.40	$ (0.10)	$ 0.69
Options [Member]
Antidilutive Securities [Abstract]
Antidilutive shares excluded from computation of earnings per share (in shares)	746,094	455,339		1,504,794	292,239

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