Note 3 - Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Net income (loss)	$ 652,146	$ (696,760)
Weighted average number of common shares outstanding – basic (in shares)	7,770,298	7,444,732
Effect of dilutive securities (in shares)	11,391	0
Diluted weighted-average shares outstanding (in shares)	7,781,689	7,444,732
Net income (loss) per share – basic (in dollars per share)	$ 0.08	$ (0.09)
Net income (loss) per share – diluted (in dollars per share)	$ 0.08	$ (0.09)