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Major Customers (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | 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, 2019 USD ($) Customer | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
Navistar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  |  | 56,882,000 | 55,153,000 | 39,768,000
Volvo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  |  | 48,749,000 | 46,160,000 | 35,716,000
Paccar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  |  | 46,068,000 | 44,452,000 | 29,413,000
UFP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  |  | 25,395,000 | 28,146,000 | 0
Other customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 107,196,000 | 95,574,000 | 56,776,000
Customer Concentration Risk [Member] | Sales Revenue, Total [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of major customers, Sales | Customer |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
Product [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales | 54,585,000 | 67,511,000 | 75,440,000 | 71,451,000 | 68,975,000 | 62,305,000 | 65,225,000 | 59,712,000 | 37,900,000 | 37,593,000 | 36,794,000 | 36,336,000 | $ 268,987,000 | 256,217,000 | 148,623,000
Product [Member] | Navistar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  |  | 54,798,000 | 52,347,000 | 39,609,000
Product [Member] | Volvo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  |  | 48,487,000 | 46,063,000 | 27,627,000
Product [Member] | Paccar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  |  | 44,543,000 | 38,027,000 | 26,481,000
Product [Member] | UFP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  |  | 25,395,000 | 27,906,000 | 0
Product [Member] | Other customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  |  | 95,764,000 | 91,874,000 | 54,906,000
Service [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total tooling sales | $ 1,537,000 | $ 7,144,000 | $ 5,807,000 | $ 815,000 | $ 4,187,000 | $ 2,371,000 | $ 3,376,000 | $ 3,334,000 | $ 1,165,000 | $ 901,000 | $ 10,574,000 | $ 410,000 | 15,303,000 | 13,268,000 | 13,050,000
Service [Member] | Navistar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total tooling sales |  |  |  |  |  |  |  |  |  |  |  |  | 2,084,000 | 2,806,000 | 159,000
Service [Member] | Volvo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total tooling sales |  |  |  |  |  |  |  |  |  |  |  |  | 262,000 | 97,000 | 8,089,000
Service [Member] | Paccar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total tooling sales |  |  |  |  |  |  |  |  |  |  |  |  | 1,525,000 | 6,425,000 | 2,932,000
Service [Member] | UFP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total tooling sales |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 240,000 | 0
Service [Member] | Other customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total tooling sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,432,000 | $ 3,700,000 | $ 1,870,000

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