Note 2 - Accounting Policies - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Numerator for basic and diluted earnings per share	$ 610,000	$ 1,328,000
Denominator for basic earnings per share – weighted-average shares (in shares)	6,358,000	6,297,000
Effect of dilutive securities employee stock options and restricted stock (in shares)	35,000	6,000
Denominator for diluted earnings per share – adjusted weighted-average shares (in shares)	6,393,000	6,303,000
Earnings per common share- basic (in dollars per share)	$ 0.1	$ 0.21
Earnings per common share- diluted (in dollars per share)	$ 0.1	$ 0.21