Note 7 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Provision for income taxes at the statutory federal tax rates	$ 105,820	$ (5,684)	$ (215,948)	$ 176,341
Increase (reduction) in taxes resulting from:
Dividends received deduction	(7,871)	(8,955)	(21,567)	(28,482)
Tax-exempt interest income	(15,531)	(16,433)	(46,795)	(60,249)
Proration of tax-exempt interest and dividends received deduction	5,715	5,939	16,683	21,775
Nondeductible expenses	11,523	8,404	25,751	24,450
Officer life insurance, net	263	3,579	896	(11,039)
Total	99,919	(13,150)	(240,980)	122,796
Provision for income taxes at the statutory federal tax rates	$ 105,820	$ (5,684)	$ (215,948)	$ 176,341