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, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 42,985,000 $ 48,527,000
Less accumulated depreciation (30,360,000) (32,807,000)
Property, plant and equipment, net 12,624,730 15,719,403
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 2,951,000 2,951,000
Buildings And Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 8,867,000 9,112,000
Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 26,597,000 31,394,000
Furniture And Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 4,174,000 4,811,000
Construction In Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 396,000 $ 259,000
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