Supplementary Financial Information - Earnings (loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income (loss) from continuing operations	$ (6,900)	$ 491	$ (1,758)
Net income (loss) from discontinued operations, net of tax	(180)	9,643	(3,852)
Net income (loss)	$ (7,080)	$ 10,134	$ (5,610)
Denominator:
Shares used in basic per share calculations	42,222,000	41,176,000	39,012,000
Dilutive stock options (in shares)	0	423,000	0
Weighted average common shares used in diluted computation	42,222,000	41,599,000	39,012,000
Basic:
Net income (loss) per share from continuing operations (in dollars per share)	$ (0.16)	$ 0.01	$ (0.04)
Net income (loss) per share from discontinued operations (in dollars per share)	0	0.23	(0.10)
Net income (loss) per share (in dollars per share)	(0.16)	0.24	(0.14)
Diluted:
Net income (loss) per share from continuing operations (in dollars per share)	(0.16)	0.01	(0.04)
Net income (loss) per share from discontinued operations (in dollars per share)	0.00	0.23	(0.10)
Net income (loss) per share (in dollars per share)	$ (0.16)	$ 0.24	$ (0.14)