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Selling Arrangement (Details) - Customer Contracts [Member] - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Gross cost	$ 4,000,000	$ 4,000,000
Accumulated amortization	(3,083,000)	(2,683,000)
Net carrying amount	$ 917,000	$ 1,317,000

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