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