Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2019		$ 9	$ 94,982	$ 150,487	$ (31)	$ (2,311)
Beginning Balance (shares) at Dec. 31, 2019		8,799,436				294,279
Share-based compensation			511
Share-based compensation (shares)		3,680
Net gain (loss) on derivative instruments					120
Net income (loss)				(1,411)
Ending Balance at Mar. 31, 2020		$ 9	95,493	149,076	89	$ (2,311)
Ending Balance (shares) at Mar. 31, 2020		8,803,116				294,279
Beginning Balance at Dec. 31, 2019		$ 9	94,982	150,487	(31)	$ (2,311)
Beginning Balance (shares) at Dec. 31, 2019		8,799,436				294,279
Net income (loss)	$ (11,742)
Ending Balance at Sep. 30, 2020		$ 9	96,197	138,745	1	$ (2,311)
Ending Balance (shares) at Sep. 30, 2020		8,829,732				294,279
Beginning Balance at Mar. 31, 2020		$ 9	95,493	149,076	89	$ (2,311)
Beginning Balance (shares) at Mar. 31, 2020		8,803,116				294,279
Common stock issuance under Employee Stock Purchase Plan			86
Common stock issuance under Employee Stock Purchase Plan (shares)		11,884
Share-based compensation			323
Share-based compensation (shares)		14,732
Net gain (loss) on derivative instruments					(25)
Net income (loss)				(3,331)
Ending Balance at Jun. 30, 2020		$ 9	95,902	145,745	64	$ (2,311)
Ending Balance (shares) at Jun. 30, 2020		8,829,732				294,279
Share-based compensation			295
Net gain (loss) on derivative instruments					(63)
Net income (loss)	(7,000)			(7,000)
Ending Balance at Sep. 30, 2020		$ 9	96,197	138,745	1	$ (2,311)
Ending Balance (shares) at Sep. 30, 2020		8,829,732				294,279
Beginning Balance at Dec. 31, 2020	225,680	$ 9	94,276	131,440	(45)
Beginning Balance (shares) at Dec. 31, 2020		8,883,788
Share-based compensation			309
Share-based compensation (shares)		11,034
Net gain (loss) on derivative instruments					15
Net income (loss)				(4,529)
Ending Balance at Mar. 31, 2021		$ 9	94,585	126,911	(30)
Ending Balance (shares) at Mar. 31, 2021		8,894,822
Beginning Balance at Dec. 31, 2020	225,680	$ 9	94,276	131,440	(45)
Beginning Balance (shares) at Dec. 31, 2020		8,883,788
Net income (loss)	868
Ending Balance at Sep. 30, 2021	227,545	$ 9	95,227	132,308	1
Ending Balance (shares) at Sep. 30, 2021		8,917,858
Beginning Balance at Mar. 31, 2021		$ 9	94,585	126,911	(30)
Beginning Balance (shares) at Mar. 31, 2021		8,894,822
Common stock issuance under Employee Stock Purchase Plan			71
Common stock issuance under Employee Stock Purchase Plan (shares)		11,271
Other share-based plans			47
Other share-based plans (Shares)		5,272
Share-based compensation			272
Share-based compensation (shares)		6,493
Net gain (loss) on derivative instruments					5
Net income (loss)				(2,493)
Ending Balance at Jun. 30, 2021		$ 9	94,975	124,418	(25)
Ending Balance (shares) at Jun. 30, 2021		8,917,858
Share-based compensation			252
Net gain (loss) on derivative instruments					26
Net income (loss)	7,890			7,890
Ending Balance at Sep. 30, 2021	$ 227,545	$ 9	$ 95,227	$ 132,308	$ 1
Ending Balance (shares) at Sep. 30, 2021		8,917,858