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Foreign Operations - Sales by country, based on the ship to location of customers' production facilities (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
Foreign operations:                              
Net 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
Property, plant and equipment - net 74,052,000       79,206,000               74,052,000 79,206,000  
United States                              
Foreign operations:                              
Net sales                         136,424,000 178,953,000 181,207,000
Property, plant and equipment - net 36,698,000       39,132,000               36,698,000 39,132,000  
Mexico                              
Foreign operations:                              
Net sales                         64,942,000 79,761,000 74,029,000
Property, plant and equipment - net 29,537,000       31,865,000               29,537,000 31,865,000  
Canada                              
Foreign operations:                              
Net sales                         16,827,000 16,988,000 12,494,000
Property, plant and equipment - net $ 7,817,000       $ 8,209,000               7,817,000 8,209,000  
Other                              
Foreign operations:                              
Net sales                         $ 4,163,000 $ 8,588,000 $ 1,755,000