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Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]    
Deferred tax assets, Accrued postretirement and pension benefits $ 360 $ 149
Deferred tax liabilities, Intangible assets (26) (22)
Deferred tax assets, Accrued expenses 2,326 1,367
Deferred tax assets, Accrued warranty costs 0  
Prepaid expenses (1,155)  
Deferred tax assets, Deferred state and local incentive revenue   537
Deferred Tax Assets Accrued severance 0  
Deferred tax assets, Inventory valuation 1,219 496
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 (1,166)  
Deferred tax assets, Net operating loss, tax credit, and interest carryforwards 65,218 62,536
Deferred tax assets, Stock-based compensation expense 1,715 1,539
Deferred tax assets, Other 371 99
Right of use asset (10,902) (4,780)
Deferred tax Liabilities, Other (1,448)  
Lease liability 11,376 5,175
Deferred Tax Assets, Gross, Total 82,585 72,001
Deferred Tax Liabilities, Gross, Total (14,697) (4,802)
Deferred Tax Assets, Valuation Allowance (67,881) (67,204)
Deferred tax assets, net, total 14,704 4,797
Deferred tax liabilities, net, total (14,697) (4,802)
Increase (decrease) in valuation allowance $ 677 $ 7,591