Condensed Consolidated Statements of Shareholders' Equity Statement - 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	1,067			1,067
Restricted shares issued, net			$ 51	(51)
Restricted shares issued, net (in shares)			168
Shares issued upon exercise of SSARs			$ 4	(4)
Shares issued upon exercise of SSARs (in shares)			14
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(96)		$ (1)	(95)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(4)
Net loss	(1,575)				(1,575)
Unrealized translation adjustments	(95)					(95)
Ending balance at Jun. 30, 2019	99,923	$ 9,482	$ (2,379)	1,698	91,476	(354)
Ending balance (in shares) at Jun. 30, 2019		31,607	(7,927)
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	1,426			1,426
Restricted shares issued, net			$ (4)	4
Restricted shares issued, net (in shares)			(14)
Shares issued upon exercise of SSARs			$ 8	(8)
Shares issued upon exercise of SSARs (in shares)			25
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(155)		$ (2)	(153)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(8)
Net loss	(517)				(517)
Series A convertible preferred stock issuance costs	(937)				(937)
Series A convertible preferred stock dividends	(199)				(199)
Unrealized translation adjustments	(25)					(25)
Ending balance at Jun. 30, 2020	$ 71,350	$ 9,482	$ (2,399)	$ 6,760	$ 57,331	$ 176
Ending balance (in shares) at Jun. 30, 2020		31,607	(7,994)