Note 1 - Organization and Significant Accounting Policies - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net income	$ 57,174	$ 80,000	$ (237,754)	$ 19,546
Weighted average number of common shares outstanding - basic (in shares)	8,008,312	7,775,266	7,866,386	7,774,270
Effect of dilutive securities (in shares)	4,983	25,996	0	29,874
Diluted weighted-average shares outstanding (in shares)	8,013,295	7,801,262	7,866,386	7,804,144
Basic income per common share (in dollars per share)	$ 0.01	$ 0.01	$ (0.03)	$ 0
Diluted income per common share (in dollars per share)	$ 0.01	$ 0.01	$ (0.03)	$ 0