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Critical Accounting Policy (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt, Current $ 59,037,000   $ 59,037,000   $ 3,230,000
Deferred Tax Assets, Valuation Allowance         0
Costs in Excess of Billings, Current 1,061,000   $ 1,061,000   3,915,000
Number of Reporting Units     2    
Deferred Tax Assets, Gross, Noncurrent 3,689,000   $ 3,689,000    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (23,000) $ (12,000) (71,000) $ (36,000)  
Postemployment Benefits Liability 8,063,000   8,063,000   8,076,000
Self Insurance Reserve 1,096,000   1,096,000   960,000
Goodwill, Impairment Loss $ 4,100,000 $ 0 $ 4,100,000 $ 0 $ 2,403,000
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 19.00%   19.00%   23.00%
Asset Impairment Charges     $ 0    
Inventory Valuation Reserves $ 836,000   836,000   $ 957,000
Allowance for Doubtful Accounts Receivable 51,000   51,000   25,000
Deferred Tax Liabilities, Net 1,153,000   1,153,000    
Accounts Receivable, Allowance for Chargebacks 1,034,000   1,034,000   2,344,000
Billings in Excess of Cost, Current 1,344,000   1,344,000   $ 1,686,000
UNITED STATES          
Deferred Tax Assets, Gross, Noncurrent 1,904,000   1,904,000    
CANADA          
Deferred Tax Assets, Gross, Noncurrent 1,395,000   1,395,000    
MEXICO          
Deferred Tax Assets, Gross, Noncurrent $ 390,000   $ 390,000