Note 8 - Basic and Diluted Earnings Per Common Share - Reconciliation of Net Income and Number of Shares Used in Computations of Basic and Diluted EPS (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net income	$ 576,000	$ 552,000
Basic weighted average common shares outstanding (in shares)	11,285,296	12,150,067
Add: dilutive effect of common stock options (in shares)	104,098	43,535
Diluted weighted average common shares outstanding (in shares)	11,389,394	12,193,602
Basic earnings per common share (in dollars per share)	$ 0.05	$ 0.05
Diluted earnings per common share (in dollars per share)	$ 0.05	$ 0.05