Note 3 - Fair Value Disclosures - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale	$ 109,168,285	$ 110,955,697
Equity securities	16,416,766	15,087,917
Total marketable investments measured at fair value	125,585,051	126,043,614
Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	1,295,211	1,289,774
Equity securities	13,369,954	12,191,621
Total marketable investments measured at fair value	14,665,165	13,481,395
Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	107,873,074	109,665,923
Equity securities	3,046,812	2,896,296
Total marketable investments measured at fair value	110,919,886	112,562,219
US Treasury Securities [Member]
Debt Securities, Available-for-Sale	1,295,211	1,289,774
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	1,295,211	1,289,774
MBS,ABS,CMBS [Member]
Debt Securities, Available-for-Sale	45,834,486	47,020,328
MBS,ABS,CMBS [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	45,834,486	47,020,328
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale	42,444,447	42,981,718
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	42,444,447	42,981,718
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale	19,413,101	19,493,317
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	19,413,101	19,493,317
Redeemable Preferred Stock [Member]
Debt Securities, Available-for-Sale	181,040	170,560
Redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	181,040	170,560
Common Stock [Member]
Equity securities	13,369,954	12,191,621
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Equity securities	13,369,954	12,191,621
Common Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Equity securities	0
Preferred Stock [Member]
Equity securities	3,046,812	2,896,296
Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Equity securities	$ 3,046,812	$ 2,896,296