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Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) plant customer | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2024 bank | Dec. 31, 2024 employee | Dec. 31, 2024 salariedEmployee | Dec. 31, 2024 hourlyEmployee
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Number of banks | bank |  |  |  | 4 |  |  |
Cash and cash equivalents | $ 41,803,000 | $ 24,104,000 |  |  |  |  |
Allowance for doubtful accounts | 0 | 0 |  |  |  |  |
Accounts receivable for chargebacks | 227,000 | 138,000 |  |  |  |  |
Allowance for slow moving and obsolete inventory | 1,392,000 | 671,000 |  |  |  |  |
Contract assets | 758,000 | 77,000 |  |  |  |  |
Contract liabilities | 2,286,000 | 5,204,000 |  |  |  |  |
Amount of revenue from contract liabilities related to open jobs outstanding | 6,069,000 | 2,446,000 |  |  |  |  |
Impairment of long-lived assets | 0 | 0 | $ 0 |  |  |  |
Loss on disposal of assets | 241,000 | 80,000 | 0 |  |  |  |
Goodwill impairment | 0 | 0 |  |  |  |  |
Liability for self insurance reserve | 1,087,000 | 988,000 |  |  |  |  |
Liability for post retirement healthcare benefits | $ 3,298,000 | 3,116,000 |  |  |  |  |
Number of major customers | customer | 5 |  |  |  |  |  |
Number of employees |  |  |  |  | 1,570 | 335 | 1,235
Number major plants | plant | 4 |  |  |  |  |  |
Research and development costs | $ 1,900,000 | 1,700,000 | 1,600,000 |  |  |  |
Net foreign current translation and transaction expense | $ 1,045,000 | $ 291,000 | $ 401,000 |  |  |  |
United States |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Number of employees | employee |  |  |  |  | 509 |  |
Mexico |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Number of employees | employee |  |  |  |  | 880 |  |
Canada |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Number of employees | employee |  |  |  |  | 181 |  |
Workforce Subject to Collective Bargaining Arrangements | Geographic Concentration Risk | United States, Canada and Mexico |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
concentration risk percentage | 67.40% |  |  |  |  |  |
Five Largest Customers | Revenue Benchmark | Customer Concentration Risk |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
concentration risk percentage | 69.00% | 68.00% | 64.00% |  |  |  |
Five Largest Customers | Accounts Receivable | Customer Concentration Risk |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
concentration risk percentage | 71.00% |  |  |  |  |  |
Contract-Based Intangible Assets |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Impairment on contract assets | $ 0 | $ 0 |  |  |  |  |

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