Condensed Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balances, shares (in shares) at Dec. 31, 2022	25,353,119
Balances at Dec. 31, 2022	$ 25	$ 116,187	$ (103,134)	$ 13,078
Stock-based compensation	$ 0	872	0	872
Stock option exercises, shares (in shares)	202,126
Stock option exercises	$ 1	131	0	132
Net loss	$ 0	0	(2,660)	(2,660)
Balances, shares (in shares) at Mar. 31, 2023	25,504,378
Balances at Mar. 31, 2023	$ 26	117,009	(105,794)	$ 11,241
Shares withheld related to net share settlement of stock option exercises (in shares)	(50,867)			(50,867)
Shares withheld related to net share settlement of stock option exercises	$ 0	(181)	0	$ (181)
Balances, shares (in shares) at Dec. 31, 2023	25,688,062
Balances at Dec. 31, 2023	$ 26	119,521	(104,070)	15,477
Stock-based compensation, shares (in shares)	0
Stock-based compensation	$ 0	821	0	$ 821
Stock option exercises, shares (in shares)	2,500			2,500
Stock option exercises	$ 0	7	0	$ 7
Net loss	$ 0	0	(811)	(811)
Balances, shares (in shares) at Mar. 31, 2024	25,690,562
Balances at Mar. 31, 2024	$ 26	$ 120,349	$ (104,881)	$ 15,494