Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	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		524		524
Net Income (loss)			(460)	(460)
Balance at Sep. 30, 2020	$ 426	118,116	(73,332)	45,210
Balance (in shares) at Sep. 30, 2020	42,664,274
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 upon exercise of stock options (in shares)				1,967,562
Balance at Dec. 31, 2020	$ 433	118,269	(78,080)	$ 40,622
Balance (in shares) at Dec. 31, 2020	43,347,887
Balance at Jun. 30, 2020	$ 426	117,890	(73,371)	44,945
Balance (in shares) at Jun. 30, 2020	42,628,560
Issuance of common stock for services		35		35
Issuance of common stock for services (in shares)	35,714
Stock compensation expense		191		191
Net Income (loss)			39	39
Balance at Sep. 30, 2020	$ 426	118,116	(73,332)	45,210
Balance (in shares) at Sep. 30, 2020	42,664,274
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)	8,530
Stock compensation expense		509		509
Issuance of common stock upon exercise of stock options	$ 6	75		$ 81
Issuance of common stock upon exercise of stock options (in shares)	603,331			1,373,905
Excess tax benefits from exercise of stock options		(346)		$ (346)
Net Income (loss)			26,071	26,071
Balance at Sep. 30, 2021	$ 440	118,507	(52,009)	66,938
Balance (in shares) at Sep. 30, 2021	43,959,748
Balance at Jun. 30, 2021	$ 437	118,639	(67,879)	51,197
Balance (in shares) at Jun. 30, 2021	43,707,392
Issuance of common stock for services	$ 1			1
Issuance of common stock for services (in shares)	8,530
Stock compensation expense		139		139
Issuance of common stock upon exercise of stock options	$ 2	75		77
Issuance of common stock upon exercise of stock options (in shares)	243,826
Excess tax benefits from exercise of stock options		(346)		(346)
Net Income (loss)			15,870	15,870
Balance at Sep. 30, 2021	$ 440	$ 118,507	$ (52,009)	$ 66,938
Balance (in shares) at Sep. 30, 2021	43,959,748