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Major Customers - Sales revenue for customers (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
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, 2020
Dec. 31, 2019
Dec. 31, 2018
Major customers:                              
Total sales $ 60,654,000 $ 59,873,000 $ 37,806,000 $ 64,023,000 $ 56,122,000 $ 74,655,000 $ 81,247,000 $ 72,266,000 $ 73,162,000 $ 64,676,000 $ 68,601,000 $ 63,046,000 $ 222,356,000 $ 284,290,000 $ 269,485,000
Navistar                              
Major customers:                              
Total sales                         40,225,000 56,882,000 55,153,000
Universal Forest Products                              
Major customers:                              
Total sales                         21,931,000 20,982,000 15,798,000
Volvo                              
Major customers:                              
Total sales                         28,504,000 46,068,000 44,452,000
Paccar                              
Major customers:                              
Total sales                         25,724,000 48,749,000 46,160,000
Other customers                              
Major customers:                              
Total sales                         67,442,000 86,214,000 79,776,000
Customer Concentration Risk | Sales Revenue, Total | Universal Forest Products                              
Major customers:                              
Total sales                         38,530,000 25,395,000 28,146,000
Product                              
Major customers:                              
Total sales 58,563,000 54,240,000 35,847,000 61,930,000 54,585,000 67,511,000 75,440,000 71,451,000 68,975,000 62,305,000 65,225,000 59,712,000 210,580,000 268,987,000 256,217,000
Product | Navistar                              
Major customers:                              
Total sales                         33,656,000 54,798,000 52,347,000
Product | Universal Forest Products                              
Major customers:                              
Total sales                         20,269,000 16,774,000 13,629,000
Product | Volvo                              
Major customers:                              
Total sales                         27,997,000 44,543,000 38,027,000
Product | Paccar                              
Major customers:                              
Total sales                         23,538,000 48,487,000 46,063,000
Product | Other customers                              
Major customers:                              
Total sales                         66,590,000 78,990,000 78,245,000
Product | Customer Concentration Risk | Sales Revenue, Total | Universal Forest Products                              
Major customers:                              
Total sales                         38,530,000 25,395,000 27,906,000
Tooling                              
Major customers:                              
Total sales $ 2,091,000 $ 5,633,000 $ 1,959,000 $ 2,093,000 $ 1,537,000 $ 7,144,000 $ 5,807,000 $ 815,000 $ 4,187,000 $ 2,371,000 $ 3,376,000 $ 3,334,000 11,776,000 15,303,000 13,268,000
Tooling | Navistar                              
Major customers:                              
Total sales                         6,569,000 2,084,000 2,806,000
Tooling | Universal Forest Products                              
Major customers:                              
Total sales                         1,662,000 4,208,000 2,169,000
Tooling | Volvo                              
Major customers:                              
Total sales                         507,000 1,525,000 6,425,000
Tooling | Paccar                              
Major customers:                              
Total sales                         2,186,000 262,000 97,000
Tooling | Other customers                              
Major customers:                              
Total sales                         852,000 7,224,000 1,531,000
Tooling | Customer Concentration Risk | Sales Revenue, Total | Universal Forest Products                              
Major customers:                              
Total sales                         $ 0 $ 0 $ 240,000