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Business Combination Business Combination, Pro Forma Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales | $ 73,162,000 | $ 64,676,000 | $ 68,601,000 | $ 63,046,000 | $ 39,065,000 | $ 38,494,000 | $ 47,368,000 | $ 36,746,000 | $ 49,072,000 | $ 41,336,000 | $ 39,006,000 | $ 45,468,000 | $ 269,485,000 | $ 161,673,000 | $ 174,882,000
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 |

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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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