Note 4 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Recurring [Member] - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Fair value, beginning of period	$ 176,000
Corporate Debt Securities [Member]
Fair value, beginning of period		$ 181,600
Principal payment	0	(5,600)
Acquisition	0	0
Investment related gains	0	0
Fair value, end of period	176,000	176,000
Collateralized Mortgage-Backed Securities [Member]
Fair value, beginning of period	487,500	396,250
Principal payment	0	0
Acquisition	0	0
Investment related gains	0	91,250
Fair value, end of period	487,500	487,500
Term Loans [Member]
Fair value, beginning of period	18,065,322	18,149,718
Principal payment	(50,458)	(298,341)
Acquisition	815,948	978,391
Investment related gains	4,964	6,008
Fair value, end of period	18,835,776	18,835,776
Other Invested Assets [Member]
Fair value, beginning of period	2,165,653	1,760,777
Principal payment	(547,952)	(547,952)
Acquisition	563,313	810,545
Investment related gains	(62,186)	95,458
Fair value, end of period	$ 2,118,828	$ 2,118,828