Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2018		$ 9	$ 93,100	$ 146,191	$ 1	$ (2,290)
Beginning Balance (shares) at Dec. 31, 2018		8,752,490				292,855
Common stock issuance under Employee Stock Purchase Plan			128
Common stock issuance under Employee Stock Purchase Plan (shares)		9,270
Exercise of stock options			41
Exercise of stock options (shares)		4,050
Share-based compensation			432
Share-based compensation (shares)		6,401
Net gain (loss) on derivative instruments					(67)
Adoption of ASU 2018-02				21	(21)
Net (loss) income				1,222
Ending Balance at Mar. 31, 2019		$ 9	93,701	147,434	(87)	$ (2,290)
Ending Balance (shares) at Mar. 31, 2019		8,772,211				292,855
Beginning Balance at Dec. 31, 2018		$ 9	93,100	146,191	1	$ (2,290)
Beginning Balance (shares) at Dec. 31, 2018		8,752,490				292,855
Adoption of ASU 2018-02	$ (21)
Net (loss) income	4,075
Ending Balance at Sep. 30, 2019		$ 9	94,548	150,287	125	$ (2,311)
Ending Balance (shares) at Sep. 30, 2019		8,787,837				294,279
Beginning Balance at Mar. 31, 2019		$ 9	93,701	147,434	(87)	$ (2,290)
Beginning Balance (shares) at Mar. 31, 2019		8,772,211				292,855
Common stock issuance under Employee Stock Purchase Plan			152
Common stock issuance under Employee Stock Purchase Plan (shares)		11,182
Exercise of stock options			17
Exercise of stock options (shares)		600
Share-based compensation			357			$ (21)
Share-based compensation (shares)		3,844				1,424,000
Net gain (loss) on derivative instruments					154
Net (loss) income				2,086
Ending Balance at Jun. 30, 2019		$ 9	94,227	149,520	67	$ (2,311)
Ending Balance (shares) at Jun. 30, 2019		8,787,837				294,279
Common stock issuance under Employee Stock Purchase Plan			(11)
Share-based compensation			332
Net gain (loss) on derivative instruments					58
Net (loss) income	767			767
Ending Balance at Sep. 30, 2019		$ 9	94,548	150,287	125	$ (2,311)
Ending Balance (shares) at Sep. 30, 2019		8,787,837				294,279
Beginning Balance at Dec. 31, 2019	243,136	$ 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 (loss) income				(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	243,136	$ 9	94,982	150,487	(31)	$ (2,311)
Beginning Balance (shares) at Dec. 31, 2019		8,799,436				294,279
Net (loss) income	(11,742)
Ending Balance at Sep. 30, 2020	232,641	$ 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 (loss) income				(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 (loss) income	(7,000)			(7,000)
Ending Balance at Sep. 30, 2020	$ 232,641	$ 9	$ 96,197	$ 138,745	$ 1	$ (2,311)
Ending Balance (shares) at Sep. 30, 2020		8,829,732				294,279