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Critical Accounting Policy (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Accounting Policies [Abstract] |  |  |
Number of Reporting Units | 2 |  |
Deferred Tax Assets, Net, Noncurrent | $ 1,153,000 |  | $ 1,153,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (24,000) | $ (12,000) |
Postemployment Benefits Liability | 8,064,000 |  | 8,076,000
Self Insurance Reserve | 1,034,000 |  | 960,000
Goodwill, Impairment Loss | 0 | 0 | $ 2,403,000
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  | 23.00%
Asset Impairment Charges | 0 | $ 0 |
Inventory Valuation Reserves | 928,000 |  | $ 957,000
Allowance for Doubtful Accounts Receivable | 47,000 |  | 25,000
Deferred Tax Liabilities, Net |  |  | 395,000
Accounts Receivable, Allowance for Chargebacks | $ 2,952,000 |  | $ 2,344,000

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