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	7,053			7,053
Restricted shares issued, net			$ 3	(3)
Restricted shares issued, net (in shares)			11
Shares issued upon exercise of SSARs			$ 182	(182)
Shares issued upon exercise of SSARs (in shares)			609
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares	(1,265)		$ (7)	(1,258)
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares (in shares)			(24)
Net income	2,954				2,954
Series A convertible preferred stock dividends	(918)				(918)
Unrealized translation adjustments	18					18
Ending balance at Sep. 30, 2021	87,718	$ 9,482	$ (2,100)	42,867	37,412	57
Ending balance (in shares) at Sep. 30, 2021		31,607	(7,000)
Beginning balance at Jun. 30, 2021	84,487	$ 9,482	$ (2,111)	40,190	36,889	37
Beginning balance (in shares) at Jun. 30, 2021		31,607	(7,038)
Share-based compensation	3,327			3,327
Restricted shares issued, net (in shares)			1
Shares issued upon exercise of SSARs			$ 15	(15)
Shares issued upon exercise of SSARs (in shares)			51
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares	(639)		$ (4)	(635)
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares (in shares)			(14)
Net income	982				982
Series A convertible preferred stock dividends	(459)				(459)
Unrealized translation adjustments	20					20
Ending balance at Sep. 30, 2021	87,718	$ 9,482	$ (2,100)	42,867	37,412	57
Ending balance (in shares) at Sep. 30, 2021		31,607	(7,000)
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	6,019			6,019
Restricted shares issued, net			$ 73	(73)
Restricted shares issued, net (in shares)			245
Shares issued upon exercise of SSARs			$ 37	(37)
Shares issued upon exercise of SSARs (in shares)			123
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares	(1,812)		$ (12)	(1,800)
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares (in shares)			(39)
Net income	6,615				6,615
Series A convertible preferred stock dividends	(918)				(918)
Unrealized translation adjustments	(654)					(654)
Ending balance at Sep. 30, 2022	106,594	$ 9,482	$ (1,965)	54,072	45,715	(710)
Ending balance (in shares) at Sep. 30, 2022		31,607	(6,550)
Beginning balance at Jun. 30, 2022	101,276	$ 9,482	$ (1,974)	51,624	42,598	(454)
Beginning balance (in shares) at Jun. 30, 2022		31,607	(6,582)
Share-based compensation	3,396			3,396
Restricted shares issued, net			$ (2)	2
Restricted shares issued, net (in shares)			(5)
Shares issued upon exercise of SSARs			$ 16	(16)
Shares issued upon exercise of SSARs (in shares)			54
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares	(939)		$ (5)	(934)
Shares withheld for taxes upon exercise of SSARs or vesting of restricted shares (in shares)			(17)
Net income	3,576				3,576
Series A convertible preferred stock dividends	(459)				(459)
Unrealized translation adjustments	(256)					(256)
Ending balance at Sep. 30, 2022	$ 106,594	$ 9,482	$ (1,965)	$ 54,072	$ 45,715	$ (710)
Ending balance (in shares) at Sep. 30, 2022		31,607	(6,550)