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, 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	2,295			2,295
Restricted shares issued, net			$ 43	(43)
Restricted shares issued, net (in shares)			144
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	(120)		$ (1)	(119)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(5)
Net income (loss)	(4,493)				(4,493)
Unrealized translation adjustments	61					61
Ending balance at Sep. 30, 2019	98,365	$ 9,482	$ (2,386)	2,909	88,558	(198)
Ending balance (in shares) at Sep. 30, 2019		31,607	(7,949)
Beginning balance at Jun. 30, 2019	99,923	$ 9,482	$ (2,379)	1,698	91,476	(354)
Beginning balance (in shares) at Jun. 30, 2019		31,607	(7,927)
Share-based compensation	1,228			1,228
Restricted shares issued, net			$ (8)	8
Restricted shares issued, net (in shares)			(24)
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	(24)			(24)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(1)
Net income (loss)	(2,918)				(2,918)
Unrealized translation adjustments	156					156
Ending balance at Sep. 30, 2019	98,365	$ 9,482	$ (2,386)	2,909	88,558	(198)
Ending balance (in shares) at Sep. 30, 2019		31,607	(7,949)
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 (loss)	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 (loss)	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)