Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Dec. 31, 2020	$ 18	$ 141,612	$ (119,419)	$ 22,211
Balance, shares at Dec. 31, 2020	18,410,458
Equity compensation		981		981
Issuance of shares for vested restricted stock grants
Issuance of shares for restricted stock grants, shares	1,754
Net loss			(4,624)	(4,624)
Exercise of stock options, net of cashless exercise of 58,122 shares and 92,634 shares withheld	1	1		1,709
Ending balance, value at Mar. 31, 2021	$ 19	144,301	(124,043)	20,277
Balance, shares at Mar. 31, 2021	18,593,757
Beginning balance, value at Dec. 31, 2021	$ 19	146,455	(126,897)	19,577
Balance, shares at Dec. 31, 2021	18,660,369
Equity compensation		829		829
Issuance of shares for vested restricted stock grants
Issuance of shares for restricted stock grants, shares	14,611
Net loss			(1,468)	(1,468)
Exercise of stock options, net of cashless exercise of shares, shares	181,545
Ending balance, value at Mar. 31, 2022	$ 19	$ 147,284	$ (128,365)	$ 18,938
Balance, shares at Mar. 31, 2022	18,674,980