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Income Taxes - Reconciliation of Differences between Federal Statutory and Effective Income Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Disclosure [Abstract] |  |  |
At statutory rate | $ 53 | $ (473) | $ (821)
State taxes, net of U.S. federal benefit | (176) | (1,554) | (162)
Current portion of long-term debt | 189 | 305 | 0
Federal tax deductions | (3,507) | (3,231) | (3,299)
Change in applicable tax rate | 8 | (436) | 26
Provision to return permanent difference | 4 | (810) | (17)
R&D credits | (166) | (149) | (209)
Fuel tax credit | (226) | (181) | (142)
Unrecognized tax benefits | 0 | 0 | 70
NOL carryback/carryforward | 1,265 | (714) | 14
Nondeductible asset basis | (184) | 342 | 909
Compensation deduction limitation | 0 | 0 | 426
Total income tax benefit | $ (2,740) | $ (6,901) | $ (3,205)

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