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v3.19.1

Major Customers (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) Customer | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total product sales | $ 68,975,000 | $ 62,305,000 | $ 65,225,000 | $ 59,712,000 | $ 37,900,000 | $ 37,593,000 | $ 36,794,000 | $ 36,336,000 | $ 33,465,000 | $ 33,816,000 | $ 36,813,000 | $ 42,530,000 | $ 256,217,000 | $ 148,623,000 | $ 146,624,000
Total tooling sales | 4,187,000 | 2,371,000 | 3,376,000 | 3,334,000 | 1,165,000 | 901,000 | 10,574,000 | 410,000 | 15,607,000 | 7,520,000 | 2,193,000 | 2,938,000 | 13,268,000 | 13,050,000 | 28,258,000
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
Navistar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total product sales |  |  |  |  |  |  |  |  |  |  |  |  | 52,347,000 | 39,609,000 | 39,756,000
Total tooling sales |  |  |  |  |  |  |  |  |  |  |  |  | 2,806,000 | 159,000 | 1,994,000
Total sales |  |  |  |  |  |  |  |  |  |  |  |  | 55,153,000 | 39,768,000 | 41,750,000
Volvo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total product sales |  |  |  |  |  |  |  |  |  |  |  |  | 46,063,000 | 27,627,000 | 29,520,000
Total tooling sales |  |  |  |  |  |  |  |  |  |  |  |  | 97,000 | 8,089,000 | 20,450,000
Total sales |  |  |  |  |  |  |  |  |  |  |  |  | 46,160,000 | 35,716,000 | 49,970,000
Paccar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total product sales |  |  |  |  |  |  |  |  |  |  |  |  | 38,027,000 | 26,481,000 | 24,235,000
Total tooling sales |  |  |  |  |  |  |  |  |  |  |  |  | 6,425,000 | 2,932,000 | 3,481,000
Total sales |  |  |  |  |  |  |  |  |  |  |  |  | 44,452,000 | 29,413,000 | 27,716,000
UFP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total product sales |  |  |  |  |  |  |  |  |  |  |  |  | 27,906,000 | 0 | 0
Total tooling sales |  |  |  |  |  |  |  |  |  |  |  |  | 240,000 | 0 | 0
Total sales |  |  |  |  |  |  |  |  |  |  |  |  | 28,146,000 | 0 | 0
Other customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total product sales |  |  |  |  |  |  |  |  |  |  |  |  | 91,874,000 | 54,906,000 | 53,113,000
Total tooling sales |  |  |  |  |  |  |  |  |  |  |  |  | 3,700,000 | 1,870,000 | 2,333,000
Total sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 95,574,000 | $ 56,776,000 | $ 55,446,000
Customer Concentration Risk [Member] | Sales Revenue, Total [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of major customers, Sales | Customer |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |

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