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	3,479			3,479
Restricted shares issued, net			$ 42	(42)
Restricted shares issued, net (in shares)			143
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)	(7,075)				(7,075)
Unrealized translation adjustments	30					30
Ending balance at Dec. 31, 2019	96,936	$ 9,482	$ (2,387)	4,094	85,976	(229)
Ending balance (in shares) at Dec. 31, 2019		31,607	(7,950)
Beginning balance at Sep. 30, 2019	98,365	$ 9,482	$ (2,386)	2,909	88,558	(198)
Beginning balance (in shares) at Sep. 30, 2019		31,607	(7,949)
Share-based compensation	1,184			1,184
Restricted shares issued, net			$ (1)	1
Restricted shares issued, net (in shares)			(1)
Net income (loss)	(2,582)				(2,582)
Unrealized translation adjustments	(31)					(31)
Ending balance at Dec. 31, 2019	96,936	$ 9,482	$ (2,387)	4,094	85,976	(229)
Ending balance (in shares) at Dec. 31, 2019		31,607	(7,950)
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 (loss)	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 (loss)	(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)