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Note 1 - Basis of Presentation - Revenues and Profit (Loss) Allocations to Reportable Segments (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenues $ 4,476,000 $ 3,991,000 $ 8,840,000 $ 8,559,000
Net Income (Loss) Attributable to Parent, Total $ (87,000) $ (483,000) (58,000) $ (618,000)
Domestic Segment [Member]        
Revenues     7,415,000  
Net Income (Loss) Attributable to Parent, Total     (35,000)  
Foreign Segment [Member]        
Revenues     1,425,000  
Net Income (Loss) Attributable to Parent, Total     $ (23,000)