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Organization and Summary of Significant Accounting Policies - Additional Information (Details) | 3 Months Ended | 9 Months Ended |  |
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Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) Segment | Sep. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of operating segments | Segment |  |  | 2 |  |  |
Number of corporate non-operating segments | Segment |  |  | 1 |  |  |
Goodwill | $ 3,606,000 |  | $ 3,606,000 |  |  | $ 2,217,000
Gain (loss) on sale of assets |  |  | (8,000) | $ 3,942,000 |  |
Prepaid contract costs | 0 |  | 0 |  |  | 0
Federal Income Tax Expense (Benefit), Continuing Operations | 0 | $ 0 | 0 | 0 |  |
ENGlobal Business |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 1,389,000 |
Charge for reserve against the full amount of the Alliance Payment |  |  | 1,500,000 |  |  |
ENGlobal Business | Corporate |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Integration and related costs | 100,000 |  |  |  |  |
Acquisition related integration and transaction costs |  |  | 600,000 |  |  |
Fabrication Division |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  | 1,100,000 |  |
Gain on sales of excess equipment |  |  |  | 8,500,000 |  |
Fabrication Division | Houma Facilities |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  | $ 2,900,000 |  |
Automation Business Within Fabrication Division | ENGlobal Business |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Goodwill | 1,400,000 |  | 1,400,000 |  |  |
Services Division Excluding Government Business and Engineering Business | ENGlobal Business |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Goodwill | $ 2,200,000 |  | $ 2,200,000 |  |  |
Minimum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life | 3 years |  | 3 years |  |  |
Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life | 25 years |  | 25 years |  |  |
LC Facility |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Restricted cash | $ 1,200,000 |  | $ 1,200,000 |  |  | $ 1,200,000
LC Facility | Balance Sheet Date Classified as Current |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Maturity date, description |  |  | maturity dates of twelve months or less from the balance sheet date classified as current |  |  |
LC Facility | Balance Sheet Date Classified as Noncurrent |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Maturity date, description |  |  | maturity dates of longer than twelve months from the balance sheet date classified as noncurrent |  |  |

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