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Business Combination Business Combination, Pro Forma Information (Details) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Total sales	$ 56,122,000	$ 74,655,000	$ 81,247,000	$ 72,266,000	$ 73,162,000	$ 64,676,000	$ 68,601,000	$ 63,046,000	$ 39,065,000	$ 38,494,000	$ 47,368,000	$ 36,746,000	$ 284,290,000	$ 269,485,000	$ 161,673,000
Horizon Plastics [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Total sales														272,153,000	222,015,000
Business Acquisition, Pro Forma Net Income (Loss)														$ (3,788,000)	$ 8,121,000
Business Acquisition, Pro Forma Earnings Per Share, Basic														$ (0.49)	$ 1.06
Business Acquisition, Pro Forma Earnings Per Share, Diluted														$ (0.49)	$ 1.05

X

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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