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, 2019	$ 426	$ 117,557	$ (72,872)	$ 45,111
Balance (in shares) at Dec. 31, 2019	42,628,560
Issuance of common stock for services		35		35
Issuance of common stock for services (in shares)	35,714
Stock compensation expense		621		621
Issuance of common stock upon exercise of stock options	$ 7	56		$ 63
Issuance of common stock upon exercise of stock options (in shares)	683,613			1,967,562
Net Income (loss)			(5,208)	$ (5,208)
Balance at Dec. 31, 2020	$ 433	118,269	(78,080)	40,622
Balance (in shares) at Dec. 31, 2020	43,347,887
Issuance of common stock for services	$ 1			1
Issuance of common stock for services (in shares)	12,059
Stock compensation expense		511		511
Issuance of common stock upon exercise of stock options	$ 14	187		$ 201
Issuance of common stock upon exercise of stock options (in shares)	1,398,979			3,076,489
Excess tax benefits from exercise of stock options		(2,655)		$ (2,655)
Net Income (loss)			32,259	32,259
Balance at Dec. 31, 2021	$ 448	$ 116,312	$ (45,821)	$ 70,939
Balance (in shares) at Dec. 31, 2021	44,758,925