Net Income (Loss) Per Share (Details) - USD ($)	3 Months Ended						9 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of basic and diluted net income (loss) per share [Abstract]
Net income (loss)	$ 865,000	$ 6,189,000	$ (6,151,000)	$ (3,102,000)	$ 3,513,000	$ (5,495,000)	$ 903,000	$ (5,084,000)
Basic shares (in shares)	18,961,517			18,810,702			18,895,893	18,861,617
Effect of potentially dilutive securities (in shares)	344,288			0			367,221	0
Diluted shares (in shares)	19,305,805			18,810,702			19,263,114	18,861,617
Net income (loss) per share:
Basic net income (loss) per share (in dollars per share)	$ 0.05			$ (0.16)			$ 0.05	$ (0.27)
Diluted net income (loss) per share (in dollars per share)	$ 0.04			$ (0.16)			$ 0.05	$ (0.27)
Options [Member]
Antidilutive Securities [Abstract]
Antidilutive shares excluded from computation of earnings per share (in shares)	1,047,224			1,519,480			1,031,624	1,519,480