Note 3 - Fair Value Disclosures - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale	$ 97,481,837	$ 93,388,971
Equity securities	23,816,399	23,211,512
Total marketable investments measured at fair value	121,298,236	116,600,483
Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	1,270,102	1,252,960
Equity securities	20,957,988	20,438,907
Total marketable investments measured at fair value	22,228,089	21,691,867
Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	96,211,735	92,136,011
Equity securities	2,858,411	2,772,605
Total marketable investments measured at fair value	99,070,147	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	1,270,102	1,252,960
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	1,270,102	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	40,259,680	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	40,259,680	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	37,979,132	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	37,979,132	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	17,675,339	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	17,675,339	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	297,584	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	297,584	188,921
Redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale	0	0
Common Stock [Member]
Equity securities	20,957,988	20,438,907
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Equity securities	20,957,988	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	0
Preferred Stock [Member]
Equity securities	2,858,411	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	2,858,411	2,772,605
Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Equity securities	$ 0	$ 0