Note 4 - Merger and Business Combination with CrossingBridge Advisors, LLC and Enterprise Diversified, Inc. - Pro Forma Information (Details) - Merger Agreement [Member] - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Revenues	$ 8,264,005	$ 10,189,328
Net income	$ 1,656,707	$ 2,913,771
Net income per share (in dollars per share)	$ 0.46	$ 0.53