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, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 21,186,000 $ 24,667,000
Less accumulated depreciation (13,944,000) (16,429,000)
Property, plant and equipment, net 7,242,072 8,238,089
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 2,852,000 2,965,000
Buildings And Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 8,891,000 8,727,000
Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 6,404,000 9,347,000
Furniture And Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 3,012,000 $ 3,628,000
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