Note 5 - Subordinated Notes Receivable (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Sep. 06, 2018	Mar. 02, 2018
Financing Receivable, after Allowance for Credit Loss				$ 7,400,000
A&R Note [Member]
Financing Receivable, before Allowance for Credit Loss			$ 3,300,000
S&L Note [Member]
Financing Receivable, before Allowance for Credit Loss			$ 4,400,000
Financing Receivable, Credit Loss, Expense (Reversal)		$ 992,000
Proceeds from Interest Received	$ 0	$ 0