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Commitments and Contingencies (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2011
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Sep. 30, 1999
Contingent obligation              
(Benefit) Provision for contingent obligation $ 2,250,000 $ (128,000) $ 121,000 $ (112,000) $ 367,000    
Provision for contingent obligation   3,276,000   3,276,000   $ 3,389,000  
Increase (decrease) in the provision for contingent obligation due to changing interest rates   (128,000) $ 121,000 (112,000) $ 367,000    
Variable Rate Tax Exempt Infrastructure Revenue Bonds | Indirect Guarantee of Indebtedness              
Commitments and Contingencies              
Debt issued             $ 25,900,000
Outstanding amount   12,300,000   12,300,000      
Balance available in the sales and incremental property tax fund   264,000   264,000   $ 637,000  
Amount paid into the sales and incremental property tax fund       945,000      
Debt service fee   1,318,000   1,318,000      
Variable Rate Tax Exempt Infrastructure Revenue Bonds | Irrevocable direct-pay letter of credit              
Commitments and Contingencies              
Irrevocable direct-pay letter of credit issued   12,506,000   12,506,000      
Variable Rate Tax Exempt Infrastructure Revenue Bonds | Minimum | Indirect Guarantee of Indebtedness              
Commitments and Contingencies              
Annual payment range   1,100,000   1,100,000      
Variable Rate Tax Exempt Infrastructure Revenue Bonds | Maximum | Indirect Guarantee of Indebtedness              
Commitments and Contingencies              
Annual payment range   $ 1,600,000   $ 1,600,000