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Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]    
Deferred tax assets, Accrued postretirement and pension benefits $ 224 $ 360
Deferred tax liabilities, Intangible assets (30) (26)
Deferred tax assets, Accrued expenses 2,444 2,326
Deferred tax liabilities, Prepaid expenses (682) (1,155)
Deferred tax assets, Inventory valuation 524 1,219
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 (598) (1,166)
Deferred tax assets, Net operating loss, tax credit, and interest carryforwards 69,371 65,218
Deferred tax assets, Stock-based compensation expense 1,782 1,715
Deferred tax assets, Other   371
Deferred tax liabilities, Other (977) (1,448)
Deferred tax liabilities, Right of use asset (12,671) (10,902)
Deferred tax assets, Lease liability 13,354 11,376
Deferred Tax Assets, Gross, Total 87,699 82,585
Deferred Tax Liabilities, Gross, Total (14,958) (14,697)
Deferred Tax Assets, Valuation Allowance (71,640) (67,881)
Deferred tax assets, net, total 16,059 14,704
Deferred tax liabilities, net, total (14,958) (14,697)
Increase in valuation allowance $ 3,759 $ 677