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Critical Accounting Policy (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Accounting Policies [Abstract]          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ (12,000) $ (12,000) $ (36,000) $ (36,000)  
Postemployment Benefits Liability 9,020,000   9,020,000   $ 9,050,000
Self Insurance Reserve 949,000   949,000   862,000
Goodwill, Impairment Loss     0 0  
Asset Impairment Charges     0 $ 0  
Inventory Valuation Reserves 715,000   715,000   624,000
Allowance for Doubtful Accounts Receivable 18,000   18,000   0
Deferred Tax Liabilities, Net 395,000   395,000   395,000
Accounts Receivable, Allowance for Chargebacks $ 2,163,000   2,163,000   $ 857,000
Contract with Customer, Liability, Revenue Recognized     $ 561,000