Note 1 - Organization and Significant Accounting Policies - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net loss	$ (294,928)	$ (60,454)
Weighted average number of common shares outstanding – basic and diluted (in shares)	7,722,536	7,773,263
Effect of dilutive securities (in shares)	0	0
Diluted weighted-average shares outstanding (in shares)	7,722,536	7,773,263
Net loss per share – basic and diluted (in dollars per share)	$ (0.04)	$ (0.01)
Diluted loss per common share (in dollars per share)	$ (0.04)	$ (0.01)