Note 3 - Fair Value Disclosures - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale	$ 99,100,422	$ 93,388,971
Equity securities	23,087,279	23,211,512
Total marketable investments measured at fair value	122,187,701	116,600,483
Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	1,265,703	1,252,960
Equity securities	20,347,786	20,438,907
Total marketable investments measured at fair value	21,613,489	21,691,867
Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	97,834,719	92,136,011
Equity securities	2,739,493	2,772,605
Total marketable investments measured at fair value	100,574,212	94,908,616
Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale	0	0
Equity securities	0	0
Total marketable investments measured at fair value	0	0
US Treasury Securities [Member]
Debt Securities, Available-for-Sale	1,265,703	1,252,960
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	1,265,703	1,252,960
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	0	0
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale	0	0
MBS,ABS,CMBS [Member]
Debt Securities, Available-for-Sale	41,653,431	38,803,341
MBS,ABS,CMBS [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	0	0
MBS,ABS,CMBS [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	41,653,431	38,803,341
MBS,ABS,CMBS [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale	0	0
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale	39,523,491	35,602,055
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	0	0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	39,523,491	35,602,055
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale	0	0
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale	16,482,597	17,541,694
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	16,482,597	17,541,694
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale	0	0
Redeemable Preferred Stock [Member]
Debt Securities, Available-for-Sale	175,200	188,921
Redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	0	0
Redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	175,200	188,921
Redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale	0	0
Common Stock [Member]
Equity securities	20,347,786	20,438,907
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Equity securities	20,347,786	20,438,907
Common Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Equity securities	0	0
Common Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Equity securities		0
Preferred Stock [Member]
Equity securities	2,739,493	2,772,605
Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Equity securities	0	0
Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Equity securities	2,739,493	2,772,605
Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Equity securities	$ 0	$ 0