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	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Corporate Debt Securities [Member]
Fair value, beginning of period	$ 176,000	$ 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	393,750	396,250
Principal payment	0	0
Acquisition	0	0
Investment related gains	93,750	91,250
Fair value, end of period	487,500	487,500
Term Loans [Member]
Fair value, beginning of period	18,154,908	18,149,718
Principal payment	(112,841)	(247,883)
Acquisition	52,606	162,443
Investment related gains	(29,351)	1,044
Fair value, end of period	18,065,322	18,065,322
Derivative [Member]
Fair value, beginning of period	726,077	724,998
Principal payment	0	0
Acquisition	0	0
Investment related gains	287,600	288,679
Fair value, end of period	$ 1,013,677	$ 1,013,677