Annual report pursuant to Section 13 and 15(d)

Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details)

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Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 4,470,000 $ 4,275,000
Less accumulated depreciation (4,329,000) (3,970,000)
Property, plant and equipment, net 140,762 304,758
Buildings And Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 22,000 22,000
Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 3,940,000 3,946,000
Furniture And Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 508,000 280,000
Construction In Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment   $ 27,000
Minimum [Member] | Buildings And Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life 3 years  
Minimum [Member] | Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life 3 years  
Minimum [Member] | Furniture And Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life 3 years  
Maximum [Member] | Buildings And Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life 40 years  
Maximum [Member] | Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life 15 years  
Maximum [Member] | Furniture And Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life 10 years