Note 3 - Fair Value Disclosures - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale	$ 109,696,001	$ 110,955,697
Equity securities	16,499,573	15,087,917
Total marketable investments measured at fair value	126,195,574	126,043,614
Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	1,305,930	1,289,774
Equity securities	13,599,230	12,191,621
Total marketable investments measured at fair value	14,905,160	13,481,395
Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	108,390,071	109,665,923
Equity securities	2,900,343	2,896,296
Total marketable investments measured at fair value	111,290,414	112,562,219
US Treasury Securities [Member]
Debt Securities, Available-for-Sale	1,305,930	1,289,774
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	1,305,930	1,289,774
MBS,ABS,CMBS [Member]
Debt Securities, Available-for-Sale	46,381,480	47,020,328
MBS,ABS,CMBS [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	46,381,480	47,020,328
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale	42,672,106	42,981,718
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	42,672,106	42,981,718
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale	19,163,206	19,493,317
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	19,163,206	19,493,317
Redeemable Preferred Stock [Member]
Debt Securities, Available-for-Sale	173,279	170,560
Redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	173,279	170,560
Common Stock [Member]
Equity securities	13,599,230	12,191,621
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Equity securities	13,599,230	12,191,621
Common Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Equity securities	0
Preferred Stock [Member]
Equity securities	2,900,343	2,896,296
Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Equity securities	$ 2,900,343	$ 2,896,296