Note 2 - Investments - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Investments (Details) - USD ($)	Jun. 30, 2026	Dec. 31, 2025
Cost or Amortized Cost	$ 92,554,865	$ 90,036,854
Debt securities, gross unrealized gains	573,067	873,964
Debt Securities, Gross Unrealized Losses	(4,441,766)	(4,376,114)
Debt securities, fair value	88,686,166	86,534,704
US Treasury Securities [Member]
Cost or Amortized Cost	818,242	810,255
Debt securities, gross unrealized gains	0	1,562
Debt Securities, Gross Unrealized Losses	(88,408)	(78,925)
Debt securities, fair value	729,834	732,892
Corporate Debt Securities [Member]
Cost or Amortized Cost	29,646,466	30,702,897
Debt securities, gross unrealized gains	113,903	218,634
Debt Securities, Gross Unrealized Losses	(2,702,170)	(2,622,315)
Debt securities, fair value	27,058,199	28,299,216
US States and Political Subdivisions Debt Securities [Member]
Cost or Amortized Cost	6,325,142	6,341,809
Debt securities, gross unrealized gains	5,633	1,735
Debt Securities, Gross Unrealized Losses	(570,396)	(536,408)
Debt securities, fair value	5,760,379	5,807,136
Redeemable Preferred Stock [Member]
Cost or Amortized Cost	1,671,335	2,142,141
Debt securities, gross unrealized gains	717	3,788
Debt Securities, Gross Unrealized Losses	(165,189)	(147,491)
Debt securities, fair value	1,506,863	1,998,438
Term Loans [Member]
Cost or Amortized Cost	13,093,474	11,187,284
Debt securities, gross unrealized gains	35,672	10,032
Debt Securities, Gross Unrealized Losses	(161,058)	(191,512)
Debt securities, fair value	12,968,088	11,005,804
Collateralized Mortgage-Backed Securities [Member]
Cost or Amortized Cost	41,000,206	38,852,468
Debt securities, gross unrealized gains	417,142	638,213
Debt Securities, Gross Unrealized Losses	(754,545)	(799,463)
Debt securities, fair value	$ 40,662,803	$ 38,691,218

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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