Note 1 - Organization and Significant Accounting Policies - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Net income (loss)	$ 32,156	$ (133,679)	$ (513,965)	$ 936,335
Net loss	$ 32,156	$ (133,679)	$ (513,965)	$ 936,335
Weighted average number of common shares outstanding - basic (in shares)	8,527,467	8,061,400	8,385,460	8,051,294
Net income (loss) per share – basic (in dollars per share)	$ 0	$ (0.02)	$ (0.06)	$ 0.12
Effect of dilutive securities (in shares)	62,411	0	0	7,750
Diluted weighted-average shares outstanding (in shares)	8,589,878	8,061,400	8,385,460	8,059,044
Net income (loss) per share – diluted (in dollars per share)	$ 0	$ (0.02)	$ (0.06)	$ 0.12