Note 5 - Operating Segments - Reconciliation of Segment Revenues, Income Before Income Taxes, and Assets (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Revenues	$ 13,299,558	$ 13,637,972
Reportable Legal Entities [Member]
Revenues	13,700,000	13,946,000
Intersegment Eliminations [Member]
Revenues	$ 401,000	$ 308,000	$ 308,000