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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 22, 2017
Dec. 31, 2016
Railcars Available for Lease, Useful Life 40 years      
Research and Development Expense $ 42,000 $ 298,000    
Goodwill 21,521,000 21,521,000    
Increase (decrease) in valuation allowance $ 18,187,000 $ 1,066,000    
Income tax rate 21.00% 35.00% 35.00%  
Cash and cash equivalents $ 45,070,000 $ 87,788,000   $ 96,110,000
Net cash flows provided by (used in) investing activities (10,946,000) (45,289,000)    
Contract assets 0      
Performance obligation $ 0      
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]        
Cumulative effect   (215,000)    
Accounting Standards Update 2016-09 [Member] | Additional Paid In Capital [Member]        
Cumulative effect   215,000    
Maximum [Member]        
Warranty period 7 years      
Useful life of assets related to state and local incentives 16 years      
Assets $ 47,000,000      
Liabilities $ 70,000,000      
Minimum [Member]        
Useful life of assets related to state and local incentives 7 years      
Assets $ 42,000,000      
Liabilities $ 65,000,000      
Valuation, Income Approach [Member]        
Valuation weighting 60.00%      
Valuation, Market Approach [Member]        
Valuation weighting 40.00%      
Reclassifications [Member] | Accounting Standards Update 2016-18 [Member]        
Cash and cash equivalents   3,360,000    
Net cash flows provided by (used in) investing activities   $ 3,360,000    
Manufacturing [Member]        
Goodwill $ 21,500,000