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	2,835			2,835
Restricted shares issued, net			$ (12)	12
Restricted shares issued, net (in shares)			(41)
Shares issued upon exercise of SSARs			$ 9	(9)
Shares issued upon exercise of SSARs (in shares)			28
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(180)		$ (2)	(178)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(9)
Net income	5,350				5,350
Series A convertible preferred stock issuance costs	(1,031)				(1,031)
Series A convertible preferred stock dividends	(658)				(658)
Unrealized translation adjustments	(149)					(149)
Ending balance at Sep. 30, 2020	77,924	$ 9,482	$ (2,406)	8,151	62,645	52
Ending balance (in shares) at Sep. 30, 2020		31,607	(8,019)
Beginning balance at Jun. 30, 2020	71,350	$ 9,482	$ (2,399)	6,760	57,331	176
Beginning balance (in shares) at Jun. 30, 2020		31,607	(7,994)
Share-based compensation	1,409			1,409
Restricted shares issued, net			$ (8)	8
Restricted shares issued, net (in shares)			(27)
Shares issued upon exercise of SSARs			$ 1	(1)
Shares issued upon exercise of SSARs (in shares)			3
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(25)			(25)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(1)
Net income	5,867				5,867
Series A convertible preferred stock issuance costs	(94)				(94)
Series A convertible preferred stock dividends	(459)				(459)
Unrealized translation adjustments	(124)					(124)
Ending balance at Sep. 30, 2020	77,924	$ 9,482	$ (2,406)	8,151	62,645	52
Ending balance (in shares) at Sep. 30, 2020		31,607	(8,019)
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 stock options, SSARs or vesting of restricted shares	(1,265)		$ (7)	(1,258)
Shares withheld for taxes upon exercise of stock options, 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 stock options, SSARs or vesting of restricted shares	(639)		$ (4)	(635)
Shares withheld for taxes upon exercise of stock options, 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)