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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Assets and liabilities carried at fair value measured on a recurring basis    
Money Market Funds $ 13,653,000 $ 0
Fair Value, Measurements, Recurring | Quoted prices in active markets (Level 1)    
Assets and liabilities carried at fair value measured on a recurring basis    
Money Market Funds 0 0
Trading Securities 10,168,000 10,248,000
Derivative Assets   0
Derivative Liabilities 0 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets and liabilities carried at fair value measured on a recurring basis    
Money Market Funds 13,653,000 956,000
Trading Securities 564,000 505,000
Derivative Assets   93,000
Derivative Liabilities 9,756,000 973,000
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets and liabilities carried at fair value measured on a recurring basis    
Money Market Funds 0 0
Trading Securities 0 0
Derivative Assets   0
Derivative Liabilities 0 0
Fair Value, Measurements, Recurring | Estimated Fair Value    
Assets and liabilities carried at fair value measured on a recurring basis    
Money Market Funds 13,653,000 956,000
Trading Securities 10,732,000 10,753,000
Derivative Assets   93,000
Derivative Liabilities $ 9,756,000 $ 973,000