Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common stock [Member]	Treasury stock [Member]	Capital in excess of stated value [Member]	Retained Earnings [Member]	Accumulated other comprehensive income (loss) [Member]
Beginning balance at Mar. 31, 2020	$ 71,757	$ 9,482	$ (2,401)	$ 5,491	$ 58,984	$ 201
Beginning balance (in shares) at Mar. 31, 2020		31,607	(7,997)
Share-based compensation	1,426			1,426
Restricted shares issued, net			$ (4)	4
Restricted shares issued, net (in shares)			(14)
Shares issued upon exercise of SSARs			$ 8	(8)
Shares issued upon exercise of SSARs (in shares)			25
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(155)		$ (2)	(153)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(8)
Net income (loss)	(517)				(517)
Series A convertible preferred stock issuance costs	(937)				(937)
Series A convertible preferred stock dividends	(199)				(199)
Unrealized translation adjustments	(25)					(25)
Ending balance at Jun. 30, 2020	71,350	$ 9,482	$ (2,399)	6,760	57,331	176
Ending balance (in shares) at Jun. 30, 2020		31,607	(7,994)
Beginning balance at Mar. 31, 2021	79,876	$ 9,482	$ (2,278)	37,257	35,376	39
Beginning balance (in shares) at Mar. 31, 2021		31,607	(7,596)
Share-based compensation	3,726			3,726
Restricted shares issued, net			$ 3	(3)
Restricted shares issued, net (in shares)			10
Shares issued upon exercise of SSARs			$ 167	(167)
Shares issued upon exercise of SSARs (in shares)			558
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(626)		$ (3)	(623)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(10)
Net income (loss)	1,972				1,972
Series A convertible preferred stock dividends	(459)				(459)
Unrealized translation adjustments	(2)					(2)
Ending balance at Jun. 30, 2021	$ 84,487	$ 9,482	$ (2,111)	$ 40,190	$ 36,889	$ 37
Ending balance (in shares) at Jun. 30, 2021		31,607	(7,038)