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	9,393			9,393
Restricted shares issued, net			$ 1	(1)
Restricted shares issued, net (in shares)			2
Shares issued upon exercise of SSARs			$ 12	(12)
Shares issued upon exercise of SSARs (in shares)			38
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(290)		$ (3)	(287)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(12)
Net income	3,280				3,280
Series A convertible preferred stock issuance costs	(1,031)				(1,031)
Series A convertible preferred stock dividends	(1,117)				(1,117)
Unrealized translation adjustments	(213)					(213)
Ending balance at Dec. 31, 2020	81,779	$ 9,482	$ (2,391)	14,584	60,116	(12)
Ending balance (in shares) at Dec. 31, 2020		31,607	(7,969)
Beginning balance at Sep. 30, 2020	77,924	$ 9,482	$ (2,406)	8,151	62,645	52
Beginning balance (in shares) at Sep. 30, 2020		31,607	(8,019)
Share-based compensation	6,558			6,558
Restricted shares issued, net			$ 13	(13)
Restricted shares issued, net (in shares)			43
Shares issued upon exercise of SSARs			$ 3	(3)
Shares issued upon exercise of SSARs (in shares)			10
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(110)		$ (1)	(109)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(3)
Net income	(2,070)				(2,070)
Series A convertible preferred stock dividends	(459)				(459)
Unrealized translation adjustments	(64)					(64)
Ending balance at Dec. 31, 2020	81,779	$ 9,482	$ (2,391)	14,584	60,116	(12)
Ending balance (in shares) at Dec. 31, 2020		31,607	(7,969)
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	10,847			10,847
Restricted shares issued, net			$ 31	(31)
Restricted shares issued, net (in shares)			103
Shares issued upon exercise of SSARs			$ 187	(187)
Shares issued upon exercise of SSARs (in shares)			626
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(1,458)		$ (8)	(1,450)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(28)
Net income	4,496				4,496
Series A convertible preferred stock dividends	(1,377)				(1,377)
Unrealized translation adjustments	29					29
Ending balance at Dec. 31, 2021	92,413	$ 9,482	$ (2,068)	46,436	38,495	68
Ending balance (in shares) at Dec. 31, 2021		31,607	(6,895)
Beginning balance at Sep. 30, 2021	87,718	$ 9,482	$ (2,100)	42,867	37,412	57
Beginning balance (in shares) at Sep. 30, 2021		31,607	(7,000)
Share-based compensation	3,794			3,794
Restricted shares issued, net			$ 28	(28)
Restricted shares issued, net (in shares)			92
Shares issued upon exercise of SSARs			$ 5	(5)
Shares issued upon exercise of SSARs (in shares)			17
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(193)		$ (1)	(192)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(4)
Net income	1,542				1,542
Series A convertible preferred stock dividends	(459)				(459)
Unrealized translation adjustments	11					11
Ending balance at Dec. 31, 2021	$ 92,413	$ 9,482	$ (2,068)	$ 46,436	$ 38,495	$ 68
Ending balance (in shares) at Dec. 31, 2021		31,607	(6,895)