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Note 2 - Accounting Policies - Profit (Loss) Allocations to Reportable Segments (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Net Income (Loss) Attributable to Parent, Total $ 194,000 $ (7,058,000)
Domestic Segment [Member]    
Net Income (Loss) Attributable to Parent, Total 245,000 (7,082,000)
Foreign Segment [Member]    
Net Income (Loss) Attributable to Parent, Total $ (51,000) $ 24,000