Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Dec. 31, 2019	$ 16	$ 128,669	$ (116,935)	$ 11,750
Beginning balance, shares at Dec. 31, 2019	16,041,650
Equity compensation expense		409		409
Issuance of common stock, net of costs	$ 2	10,567		10,569
Issuance of common stock, net of costs. shares	1,769,230
Exercise of stock options, net of cashless exercise of 58,926 shares		203		203
Exercise of stock options, net of cashless exercise of shares, shares	689,901
Issuance of shares for vested restricted stock grants
Issuance of shares for restricted stock grants, shares	24,778
Exercise of warrants		112		112
Exercise of warrants, shares	50,750
Settlement of executive bonuses with issuance of restricted stock units		85		85
Settlement of executive bonuses with issuance of restricted stock units, shares	14,993
Shares forfeited in exchange for withholding taxes		(1,475)		(1,475)
Shares forfeited in exchange for withholding taxes, shares	(180,844)
Net loss			558	558
Ending balance, value at Dec. 31, 2020	$ 18	138,570	(116,377)	22,211
Ending balance, shares at Dec. 31, 2020	18,410,458
Equity compensation expense		3,068		3,068
Exercise of stock options, net of cashless exercise of 58,926 shares	$ 1	46		47
Exercise of stock options, net of cashless exercise of shares, shares	301,375
Issuance of shares for vested restricted stock grants
Issuance of shares for restricted stock grants, shares	32,170
Exercise of warrants		19		19
Exercise of warrants, shares	9,000
Net loss			(4,146)	(4,146)
Ending balance, value at Dec. 31, 2021	$ 19	$ 141,703	$ (120,523)	$ 21,199
Ending balance, shares at Dec. 31, 2021	18,753,003