Note 7 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Provision for income taxes at the statutory federal tax rates	$ 549,949	$ (203,241)	$ 954,385	$ 369,439
Tax-exempt interest income	(7,882)	(8,450)	(23,717)	(27,316)
Dividends received deduction	(10,391)	(18,802)	(29,645)	(59,537)
Proration of tax-exempt interest and dividends received deduction	4,338	6,604	12,671	21,074
Nondeductible expenses	23,240	22,512	73,585	57,555
Officer life insurance, net	2,459	2,527	(2,109)	1,949
Other	4,900	0
Total	$ 566,613	$ (198,850)	$ 985,170	$ 363,164