Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - 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, 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 SSARs or vesting of restricted shares	(626)		$ (3)	(623)
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares (in shares)			(10)
Net income	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)
Beginning balance at Mar. 31, 2022	97,344	$ 9,482	$ (2,063)	49,963	40,018	(56)
Beginning balance (in shares) at Mar. 31, 2022		31,607	(6,879)
Share-based compensation	2,623			2,623
Restricted shares issued, net			$ 75	(75)
Restricted shares issued, net (in shares)			250
Shares issued upon exercise of SSARs			$ 21	(21)
Shares issued upon exercise of SSARs (in shares)			69
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares	(873)		$ (7)	(866)
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares (in shares)			(22)
Net income	3,039				3,039
Series A convertible preferred stock dividends	(459)				(459)
Unrealized translation adjustments	(398)					(398)
Ending balance at Jun. 30, 2022	$ 101,276	$ 9,482	$ (1,974)	$ 51,624	$ 42,598	$ (454)
Ending balance (in shares) at Jun. 30, 2022		31,607	(6,582)