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Note 4 - Equipment and Leasehold Improvements - Property, Plant, and Equipment (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Machinery and equipment $ 8,429,000 $ 8,089,000
Leasehold improvements 5 years or remaining lease term  
Less accumulated depreciation $ (7,175,000) (6,828,000)
Total equipment and leasehold improvements, net 1,254,000 1,261,000
Machinery and Equipment [Member]    
Machinery and equipment [1] $ 6,610,000 6,270,000
Machinery and Equipment [Member] | Minimum [Member]    
Machinery and equipment (Year) [1] 2 years 6 months  
Machinery and Equipment [Member] | Maximum [Member]    
Machinery and equipment (Year) [1] 10 years  
Computer and Software [Member]    
Machinery and equipment $ 631,000 631,000
Computer and Software [Member] | Minimum [Member]    
Machinery and equipment (Year) 2 years  
Computer and Software [Member] | Maximum [Member]    
Machinery and equipment (Year) 5 years  
Office Equipment [Member]    
Machinery and equipment $ 256,000 256,000
Office Equipment [Member] | Minimum [Member]    
Machinery and equipment (Year) 5 years  
Office Equipment [Member] | Maximum [Member]    
Machinery and equipment (Year) 10 years  
Leasehold Improvements [Member]    
Machinery and equipment $ 932,000 $ 932,000
[1] Includes