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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