Note 3 - Fair Value Disclosures - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale	$ 114,743,833	$ 110,955,697
Equity securities	17,394,612	15,087,917
Total marketable investments measured at fair value	132,138,445	126,043,614
Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	1,326,055	1,289,774
Equity securities	14,470,556	12,191,621
Total marketable investments measured at fair value	15,796,611	13,481,395
Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	113,417,778	109,665,923
Equity securities	2,924,056	2,896,296
Total marketable investments measured at fair value	116,341,834	112,562,219
US Treasury Securities [Member]
Debt Securities, Available-for-Sale	1,326,055	1,289,774
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	1,326,055	1,289,774
MBS,ABS,CMBS [Member]
Debt Securities, Available-for-Sale	47,141,221	47,020,328
MBS,ABS,CMBS [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	47,141,221	47,020,328
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale	46,192,658	42,981,718
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	46,192,658	42,981,718
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale	19,900,619	19,493,317
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	19,900,619	19,493,317
Redeemable Preferred Stock [Member]
Debt Securities, Available-for-Sale	183,280	170,560
Redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	183,280	170,560
Common Stock [Member]
Equity securities	14,470,556	12,191,621
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Equity securities	14,470,556	12,191,621
Common Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Equity securities	0
Preferred Stock [Member]
Equity securities	2,924,056	2,896,296
Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Equity securities	$ 2,924,056	$ 2,896,296