Note 3 - Fair Value Disclosures - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale, Total	$ 91,727,759	$ 105,841,543
Equity securities	20,525,880	26,388,647
Total marketable investments measured at fair value	112,253,639	132,230,190
Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale, Total	1,245,719	1,345,992
Equity securities	17,763,670	23,608,197
Total marketable investments measured at fair value	19,009,389	24,954,189
Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale, Total	90,482,040	104,495,551
Equity securities	2,762,210	2,780,450
Total marketable investments measured at fair value	93,244,250	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	1,245,719	1,345,992
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale, Total	1,245,719	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	36,504,807	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	36,504,807	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	36,080,909	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	36,080,909	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	17,690,172	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	17,690,172	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	206,152	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	206,152	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	17,763,670	23,608,197
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Equity securities	17,763,670	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	2,762,210	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	2,762,210	2,780,450
Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Equity securities	$ 0	$ 0