Consolidated Statements of Shareholders' Equity - USD ($) $ 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, 2019	$ 100,622	$ 9,482	$ (2,433)	$ 781	$ 93,051	$ (259)
Beginning balance (in shares) at Mar. 31, 2019		31,607	(8,105)
Share-based compensation	5,682			5,682
Restricted shares issued, net			$ 41	(41)
Restricted shares issued, net (in shares)			140
Shares Issued Upon Exercise of SSARs			$ 6	(6)
Shares issued upon exercise of SSARs, Shares			21,000
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares	(940)		$ (15)	(925)
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares (in shares)			(53)
Net income (loss)	(34,067)				(34,067)
Unrealized translation adjustments	460					460
Ending balance at Mar. 31, 2020	71,757	$ 9,482	$ (2,401)	5,491	58,984	201
Ending balance (in shares) at Mar. 31, 2020		31,607	(7,997)
Share-based compensation	40,066			40,066
Restricted shares issued, net			$ 28	(28)
Restricted shares issued, net (in shares)			90
Shares Issued Upon Exercise of SSARs			$ 141	(141)
Shares issued upon exercise of SSARs, Shares			467,000
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares	(8,177)		$ (46)	(8,131)
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares (in shares)			(156)
Net income (loss)	(21,001)				(21,001)
Series A convertible preferred stock issuance costs	(1,031)				(1,031)
Series A convertible preferred stock dividends	(1,576)				(1,576)
Unrealized translation adjustments	(162)					(162)
Ending balance at Mar. 31, 2021	79,876	$ 9,482	$ (2,278)	37,257	35,376	39
Ending balance (in shares) at Mar. 31, 2021		31,607	(7,596)
Share-based compensation	14,549			14,549
Restricted shares issued, net			$ 34	(34)
Restricted shares issued, net (in shares)			113
Shares Issued Upon Exercise of SSARs			$ 190	(190)
Shares issued upon exercise of SSARs, Shares			636
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares	(1,628)		$ (9)	(1,619)
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares (in shares)			(32)
Net income (loss)	6,478				6,478
Series A convertible preferred stock dividends	(1,836)				(1,836)
Unrealized translation adjustments	(95)					(95)
Ending balance at Mar. 31, 2022	$ 97,344	$ 9,482	$ (2,063)	$ 49,963	$ 40,018	$ (56)
Ending balance (in shares) at Mar. 31, 2022		31,607	(6,879)