Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Total
Balance at Dec. 31, 2020	$ 433	$ 118,269	$ (78,080)	$ 40,622
Balance (in shares) at Dec. 31, 2020	43,347,887
Value of share-based arrangements		361		361
Issuance of common stock upon exercise of stock options	$ 1			1
Issuance of common stock upon exercise of stock options (in shares)	23,804
Net Income (loss)			(1,076)	(1,076)
Balance at Mar. 31, 2021	$ 434	118,630	(79,156)	39,908
Balance (in shares) at Mar. 31, 2021	43,371,691
Balance at Dec. 31, 2020	$ 433	118,269	(78,080)	40,622
Balance (in shares) at Dec. 31, 2020	43,347,887
Balance at Dec. 31, 2021	$ 448	116,312	(45,821)	70,939
Balance (in shares) at Dec. 31, 2021	44,758,925
Value of share-based arrangements		403		403
Issuance of common stock upon exercise of stock options	$ 1	70		71
Issuance of common stock upon exercise of stock options (in shares)	150,779
Excess tax benefits from exercise of stock options		72		72
Net Income (loss)			29,555	29,555
Balance at Mar. 31, 2022	$ 449	$ 116,713	$ (16,266)	$ 100,896
Balance (in shares) at Mar. 31, 2022	44,909,704