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Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Abstract]    
Deferred tax assets, Accrued postretirement and pension benefits $ 149 $ 1,663
Deferred tax liabilities, Intangible assets (22) (17)
Deferred tax assets, Accrued expenses 1,367 2,027
Deferred tax assets, Deferred state and local incentive revenue 537 1,132
Deferred tax assets, Inventory valuation 496 3,145
Deferred tax assets, Property, plant and equipment and railcars on operating leases 103  
Deferred tax liabilities, Property, plant and equipment and railcars on operating leases   (2,018)
Deferred tax assets, Net operating loss and tax credit 62,536 48,738
Deferred tax assets, Stock-based compensation expense 1,539 1,127
Deferred tax assets, Other 99 1,135
Right of use asset (4,780) (5,543)
Lease liability 5,175 8,086
Deferred Tax Assets, Gross, Total 72,001 67,053
Deferred Tax Liabilities, Gross, Total (4,802) (7,578)
Deferred Tax Assets, Valuation Allowance (67,204) (59,613)
Deferred tax assets, net, total 4,797 7,440
Deferred tax liabilities, net, total (4,802) (7,578)
Increase (decrease) in valuation allowance $ 7,591 $ 19,821