Note 3 - Notes Receivable (Details Textual) - Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member] - USD ($)	1 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Feb. 28, 2021
Payments to Acquire Notes Receivable	$ 200,000	$ 450,000	$ 550,000
Notes Receivable, Stated Interest Rate	5.25%	5.25%	4.60%
Financing Receivable, after Allowance for Credit Loss, Current	$ 240,000
Financing Receivable, after Allowance for Credit Loss, Noncurrent	$ 364,000