Sale of DuraFit Business Sale of DuraFit Business - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 08, 2017
Discontinued Operations and Disposal Groups [Abstract]
Cash received from sale of business					$ 3,300,000
Gain on sale of DuraFit business	$ 0	$ 805,000	$ 0	$ 805,000
Proceeds used for repayment of debt				$ 315,000

Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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