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]	3 Months Ended
	Mar. 31, 2023 USD ($)
Corporate Debt Securities [Member]
Fair value, beginning of period	$ 181,600
Principal payment	(5,600)
Acquisition	0
Investment related gains	0
Fair value, end of period	176,000
Collateralized Mortgage-Backed Securities [Member]
Fair value, beginning of period	396,250
Principal payment	(2,500)
Acquisition	0
Investment related gains	0
Fair value, end of period	393,750
Term Loans [Member]
Fair value, beginning of period	18,149,718
Principal payment	(135,042)
Acquisition	109,837
Investment related gains	30,395
Fair value, end of period	18,154,908
Derivative [Member]
Fair value, beginning of period	724,998
Principal payment
Acquisition	0
Investment related gains	1,079
Fair value, end of period	$ 726,077