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Quarterly Results of Operations (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Quarterly results of operations:                              
Net sales $ 73,778 $ 86,728 $ 97,725 $ 99,507 $ 86,443 $ 101,606 $ 98,735 $ 90,592 $ 73,168 $ 81,025 $ 80,461 $ 72,829 $ 357,738 $ 377,376 $ 307,483
Gross margin 10,937 15,278 20,562 17,743 11,547 13,303 13,045 14,507 8,475 6,415 13,736 12,718 64,520 52,402 41,344
Operating income 2,517 5,875 10,070 8,075 2,974 4,632 4,385 6,012 1,942 (2,393) 6,173 5,346 26,537 18,003 11,068
Net income $ 2,182 $ 4,354 $ 7,936 $ 5,852 $ 4,832 $ 1,319 $ 2,188 $ 3,864 $ 441 $ (3,312) $ 4,086 $ 3,456 $ 20,324 $ 12,203 $ 4,671
Net income per common share:                              
Basic (in USD per share) $ 0.25 $ 0.50 $ 0.93 $ 0.69 $ 0.57 $ 0.16 $ 0.26 $ 0.46 $ 0.05 $ (0.41) $ 0.48 $ 0.41 $ 2.37 $ 1.44 $ 0.55
Diluted (in USD per share) $ 0.25 $ 0.49 $ 0.91 $ 0.66 $ 0.57 $ 0.16 $ 0.26 $ 0.46 $ 0.05 $ (0.41) $ 0.48 $ 0.41 $ 2.31 $ 1.44 $ 0.55
Product sales                              
Quarterly results of operations:                              
Net sales $ 72,439 $ 80,896 $ 95,703 $ 98,337 $ 83,143 $ 92,340 $ 93,317 $ 89,901 $ 68,132 $ 67,643 $ 79,117 $ 69,133 $ 347,375 $ 358,701 $ 284,025
Tooling sales                              
Quarterly results of operations:                              
Net sales $ 1,339 $ 5,832 $ 2,022 $ 1,170 $ 3,300 $ 9,266 $ 5,418 $ 691 $ 5,036 $ 13,382 $ 1,344 $ 3,696 $ 10,363 $ 18,675 $ 23,458