Note 3 - Fair Value Disclosures - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale, Total	$ 93,388,971	$ 105,841,543
Equity securities	23,211,512	26,388,647
Total marketable investments measured at fair value	116,600,483	132,230,190
Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale, Total	1,252,960	1,345,992
Equity securities	20,438,907	23,608,197
Total marketable investments measured at fair value	21,691,867	24,954,189
Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale, Total	92,136,011	104,495,551
Equity securities	2,772,605	2,780,450
Total marketable investments measured at fair value	94,908,616	107,276,001
Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale, Total	0	0
Equity securities	0	0
Total marketable investments measured at fair value	0	0
US Treasury Securities [Member]
Debt Securities, Available-for-Sale, Total	1,252,960	1,345,992
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale, Total	1,252,960	1,345,992
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale, Total	0	0
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale, Total	0	0
MBS,ABS,CMBS [Member]
Debt Securities, Available-for-Sale, Total	38,803,341	41,023,871
MBS,ABS,CMBS [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale, Total	0	0
MBS,ABS,CMBS [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale, Total	38,803,341	41,023,871
MBS,ABS,CMBS [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale, Total	0	0
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale, Total	35,602,055	41,206,964
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale, Total	0	0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale, Total	35,602,055	41,206,964
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale, Total	0	0
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Total	17,541,694	22,031,831
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale, Total	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale, Total	17,541,694	22,031,831
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale, Total	0	0
Redeemable Preferred Stock [Member]
Debt Securities, Available-for-Sale, Total	188,921	232,885
Redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale, Total	0	0
Redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale, Total	188,921	232,885
Redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale, Total	0	0
Common Stock [Member]
Equity securities	20,438,907	23,608,197
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Equity securities	20,438,907	23,608,197
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	2,772,605	2,780,450
Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Equity securities	0	0
Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Equity securities	2,772,605	2,780,450
Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Equity securities	$ 0	$ 0