Note 9 - Leasing Arrangements (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment, Net, Total	$ 15,878,000	$ 16,998,000
Operating Lease, Expense	49,000	41,000
Office and Equipment [Member]
Operating Lease, Payments	53,000	87,000
Asset Leased to Others [Member]
Property, Plant and Equipment, Net, Total	$ 10,100,000	$ 11,200,000