Net Income per Share (Details) - USD ($)	3 Months Ended						9 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of basic and diluted net income per share [Abstract]
Net income	$ 8,469,000	$ 15,184,000	$ (3,012,000)	$ 865,000	$ 6,189,000	$ (6,151,000)	$ 20,641,000	$ 903,000
Basic shares (in shares)	19,053,232			18,961,517			19,016,302	18,895,893
Effect of potentially dilutive securities (in shares)	383,561			344,288			317,456	367,221
Diluted shares (in shares)	19,436,793			19,305,805			19,333,758	19,263,114
Net income per share [Abstract]
Basic net income per share (in dollars per share)	$ 0.44			$ 0.05			$ 1.09	$ 0.05
Diluted net income per share (in dollars per share)	$ 0.44			$ 0.04			$ 1.07	$ 0.05
Options [Member]
Antidilutive Securities [Abstract]
Antidilutive shares excluded from computation of earnings per share (in shares)	1,319,937			1,047,224			1,328,437	1,031,624