Note 2 - Investments - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Investments (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Cost or Amortized Cost	$ 80,671,044	$ 78,653,792
Debt securities, allowance for credit loss	(116,563)	0
Debt Securities, Gross Unrealized Gains	(882,865)	(783,438)
Debt Securities, Gross Unrealized Losses	(5,165,696)	(4,927,710)
Investments in available-for-sale securities, at fair value	76,271,650	74,509,520
US Treasury Securities [Member]
Cost or Amortized Cost	797,297	790,976
Debt securities, allowance for credit loss	0	0
Debt Securities, Gross Unrealized Gains	0	0
Debt Securities, Gross Unrealized Losses	(86,674)	(66,308)
Investments in available-for-sale securities, at fair value	710,623	724,668
Corporate Debt Securities [Member]
Cost or Amortized Cost	20,249,652	20,234,444
Debt securities, allowance for credit loss	(116,563)	0
Debt Securities, Gross Unrealized Gains	(60,319)	(95,085)
Debt Securities, Gross Unrealized Losses	(2,975,117)	(2,516,167)
Investments in available-for-sale securities, at fair value	17,218,291	17,813,362
US States and Political Subdivisions Debt Securities [Member]
Cost or Amortized Cost	5,479,432	6,207,596
Debt securities, allowance for credit loss	0	0
Debt Securities, Gross Unrealized Gains	0	(4,044)
Debt Securities, Gross Unrealized Losses	(632,476)	(575,547)
Investments in available-for-sale securities, at fair value	4,846,956	5,636,093
Redeemable Preferred Stock [Member]
Cost or Amortized Cost	3,290,872	3,622,572
Debt securities, allowance for credit loss	0	0
Debt Securities, Gross Unrealized Gains	(190)	(1,699)
Debt Securities, Gross Unrealized Losses	(177,163)	(318,702)
Investments in available-for-sale securities, at fair value	3,113,899	3,305,569
Term Loans [Member]
Cost or Amortized Cost	17,532,991	17,177,179
Debt securities, allowance for credit loss	0	0
Debt Securities, Gross Unrealized Gains	(150,906)	(162,011)
Debt Securities, Gross Unrealized Losses	(290,534)	(286,770)
Investments in available-for-sale securities, at fair value	17,393,363	17,052,420
Collateralized Mortgage-Backed Securities [Member]
Cost or Amortized Cost	33,320,800	30,621,025
Debt securities, allowance for credit loss	0	0
Debt Securities, Gross Unrealized Gains	(671,450)	(520,599)
Debt Securities, Gross Unrealized Losses	(1,003,732)	(1,164,216)
Investments in available-for-sale securities, at fair value	$ 32,988,518	$ 29,977,408

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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