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Fair Value Measurements (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Fair Value Measurements    
Fair value assets, amount transferred between measurement levels $ 0  
Fair value liabilities, amount transferred between measurement levels 0  
Recurring    
Fair Value Measurements    
Total 2,768,287 $ 6,349,915
Recurring | Significant Other Observable Inputs (Level 2)    
Fair Value Measurements    
Total 2,768,287 6,349,915
Recurring | U.S. corporations    
Fair Value Measurements    
Total 2,287,809 5,429,336
Recurring | U.S. corporations | Significant Other Observable Inputs (Level 2)    
Fair Value Measurements    
Total 2,287,809 5,429,336
Recurring | International corporations    
Fair Value Measurements    
Total 480,478 920,579
Recurring | International corporations | Significant Other Observable Inputs (Level 2)    
Fair Value Measurements    
Total $ 480,478 $ 920,579