Note 2 - Accounting Policies - Profit (Loss) Allocations to Reportable Segments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Net Income (Loss) Attributable to Parent, Total	$ 1,328,000	$ 194,000
Domestic Segment [Member]
Net Income (Loss) Attributable to Parent, Total	1,187,000	245,000
Foreign Segment [Member]
Net Income (Loss) Attributable to Parent, Total	$ 141,000	$ (51,000)