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Net Income (Loss) Per Share (Details) - USD ($)	3 Months Ended				6 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reconciliation of basic and diluted net income (loss) per share [Abstract]
Net income (loss)	$ 6,189,000	$ (6,151,000)	$ 3,513,000	$ (5,495,000)	$ 38,000	$ (1,982,000)
Basic shares (in shares)	18,903,182		18,878,674		18,862,901	18,887,214
Effect of potentially dilutive securities (in shares)	314,145		440,791		383,698	0
Diluted shares (in shares)	19,217,327		19,319,465		19,246,599	18,887,214
Net income (loss) per share:
Basic net income (loss) per share (in dollars per share)	$ 0.33		$ 0.19		$ 0	$ (0.10)
Diluted net income (loss) per share (in dollars per share)	$ 0.32		$ 0.18		$ 0	$ (0.10)
Options [Member]
Antidilutive Securities [Abstract]
Antidilutive shares excluded from computation of earnings per share (in shares)	1,221,744		746,094		1,166,432	1,504,794

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