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Fair Value Measurements (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Fair Value Measurements    
Fair value assets, amount transferred between measurement levels $ 0 $ 0
Fair value liabilities, amount transferred between measurement levels 0 0
Recurring    
Fair Value Measurements    
Total 5,382,861 6,349,915
Recurring | U.S. corporations    
Fair Value Measurements    
Total 4,453,130 5,429,336
Recurring | International corporations    
Fair Value Measurements    
Total 929,731 920,579
Recurring | Significant Other Observable Inputs (Level 2)    
Fair Value Measurements    
Total 5,382,861 6,349,915
Recurring | Significant Other Observable Inputs (Level 2) | U.S. corporations    
Fair Value Measurements    
Total 4,453,130 5,429,336
Recurring | Significant Other Observable Inputs (Level 2) | International corporations    
Fair Value Measurements    
Total $ 929,731 $ 920,579