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Major Customers (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total product sales | $ 43,492,000 | $ 44,243,000 | $ 53,514,000 | $ 47,854,000 | $ 42,592,000 | $ 43,171,000 | $ 43,317,000 | $ 40,664,000 | $ 36,750,000 | $ 32,342,000 | $ 32,146,000 | $ 32,858,000 | $ 189,103,000 | $ 169,744,000 | $ 134,096,000
Total tooling sales | 3,072,000 | 3,806,000 | 1,342,000 | 1,745,000 | 1,822,000 | 420,000 | 2,807,000 | 411,000 | 898,000 | 5,092,000 | 2,535,000 | 1,504,000 | 9,965,000 | 5,460,000 | 10,029,000
Total net sales | $ 46,564,000 | $ 48,049,000 | $ 54,856,000 | $ 49,599,000 | $ 44,414,000 | $ 43,591,000 | $ 46,124,000 | $ 41,075,000 | $ 37,648,000 | $ 37,434,000 | $ 34,681,000 | $ 34,362,000 | 199,068,000 | 175,204,000 | 144,125,000
Navistar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 56,415,000 | 51,330,000 | 47,356,000
Volvo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 55,125,000 | 48,859,000 | 12,444,000
Paccar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 34,430,000 | 36,128,000 | 50,154,000
Yamaha [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 16,766,000 | 16,911,000 | 13,648,000
Other customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 36,332,000 | 21,976,000 | 20,523,000
Product sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 189,103,000 | 169,744,000 | 134,096,000
Product sales | Navistar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 50,169,000 | 51,254,000 | 46,384,000
Product sales | Volvo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 53,525,000 | 46,340,000 | 11,508,000
Product sales | Paccar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 33,452,000 | 35,602,000 | 42,784,000
Product sales | Yamaha [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 16,766,000 | 16,911,000 | 13,648,000
Product sales | Other customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 35,191,000 | 19,637,000 | 19,772,000
Tooling sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 9,965,000 | 5,460,000 | 10,029,000
Tooling sales | Navistar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 6,246,000 | 76,000 | 972,000
Tooling sales | Volvo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 | 2,519,000 | 936,000
Tooling sales | Paccar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 978,000 | 526,000 | 7,370,000
Tooling sales | Yamaha [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Tooling sales | Other customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major customers: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,141,000 | $ 2,339,000 | $ 751,000

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