Note 3 - Net Income per Share - Net Income per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Basic weighted average shares outstanding (in shares)	5,595,320	5,587,070
Dilutive effect of granted options (in shares)	0	0
Diluted weighted average shares outstanding (in shares)	5,595,320	5,587,070
Net income	$ 1,140	$ 2,036
-Basic (in dollars per share)	$ 0.20	$ 0.36
-Diluted (in dollars per share)	$ 0.20	$ 0.36