Note 1 - Description of Business and Significant Accounting Policies - Deferred Annuity Deposit-Type Contracts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Balance at beginning of period	$ 75,567,873
Receipts on deposit-type contracts	5,389,262	$ 3,987,535
Interest credited	1,597,392	1,606,340
Withdrawals on deposit-type contracts	(3,243,267)	(1,937,457)
Balance at end of period	79,035,350	75,567,873
Deferred Annuity Deposit-type Contracts [Member]
Balance at beginning of period	75,410,339	71,843,283
Receipts on deposit-type contracts	5,948,185	5,345,302
Interest credited	1,590,654	1,601,155
Withdrawals on deposit-type contracts	(4,068,636)	(3,379,401)
Balance at end of period	$ 78,880,542	$ 75,410,339