Critical Accounting Policy (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accounting Policies [Abstract]
Contract with Customer, Asset, Net	$ 683,000		$ 1,538,000
Postemployment Benefits Liability	9,049,000		9,050,000
Self Insurance Reserve	959,000		862,000
Goodwill, Impairment Loss	0	$ 0
Asset Impairment Charges	0	$ 0
Inventory Valuation Reserves	973,000		624,000
Allowance for Doubtful Accounts Receivable	0		0
Deferred Tax Liabilities, Net	395,000		395,000
Accounts Receivable, Allowance for Chargebacks	1,493,000		857,000
Contract with Customer, Liability	157,000		$ 520,000
Contract with Customer, Liability, Revenue Recognized	$ 520,000