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Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Income Tax Disclosure [Abstract] |  |
Deferred tax assets, Accrued postretirement and pension benefits | $ 634 | $ 224
Deferred tax liabilities, Intangible assets | (36) | (30)
Deferred tax assets, Accrued expenses | 2,099 | 2,444
Deferred tax liabilities, Prepaid expenses | (1,231) | (682)
Deferred tax assets, Inventory valuation | 585 | 524
Deferred tax assets, Property, plant and equipment and railcars on operating leases |  | 0
Deferred tax liabilities, Property, plant and equipment and railcars on operating leases | (219) | (598)
Deferred tax assets, Net operating loss | 53,163 | 57,252
Deferred tax assets, Interest carryforwards | 8,059 | 10,103
Deferred tax assets, Credit carryforwards | 2,016 | 2,016
Deferred tax assets, Stock-based compensation expense | 2,058 | 1,782
Deferred tax assets, Other |  | 0
Deferred tax liabilities, Other | 0 | (977)
Deferred tax liabilities, Right of use asset | (14,055) | (12,671)
Deferred tax assets, Lease liability | 15,080 | 13,354
Deferred Tax Assets, Gross, Total | 83,694 | 87,699
Deferred Tax Liabilities, Gross, Total | (15,541) | (14,958)
Deferred Tax Assets, Valuation Allowance | (67,129) | (71,640)
Deferred tax assets, net, total | 16,565 | 16,059
Deferred tax liabilities, net, total | (15,541) | (14,958)
Increase in valuation allowance | $ (4,511) | $ 3,759

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