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, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 48,527,000 $ 47,897,000
Less accumulated depreciation (32,807,000) (30,429,000)
Property, plant and equipment, net 15,719,403 17,468,420
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 2,951,000 3,099,000
Buildings And Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 9,112,000 9,422,000
Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 31,394,000 28,985,000
Furniture And Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 4,811,000 5,225,000
Construction In Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 259,000 $ 1,166,000
Minimum [Member] | Buildings And Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life 7 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 5 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