XML 49 R39.htm IDEA: XBRL DOCUMENT v3.8.0.1
Investments - Summary of Available-for-sale Securities (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2015
Available-for-sale Debt Securities [Abstract]      
Cost $ 75,720,761    
Gross Unrealized Losses (460,872)    
Gross Unrealized Gains 3,307,192 $ 2,325,079  
Fair Market Value 78,567,081    
Available-for-sale Equity Securities [Abstract]      
Cost     $ 0
Available-for-sale Securities [Abstract]      
Cost   103,986,286  
Gross Unrealized Gains   2,370,208  
Gross Unrealized Losses   (392,571)  
Fair Market Value   105,963,923  
Mutual funds      
Available-for-sale Debt Securities [Abstract]      
Cost 54,509,756 68,776,165  
Gross Unrealized Gains 0 42,097  
Gross Unrealized Losses (306,308) (252,373)  
Fair Market Value 54,203,448 68,565,889  
US corporate debt securities      
Available-for-sale Debt Securities [Abstract]      
Cost 21,211,005 35,210,121  
Gross Unrealized Gains 0 3,032  
Gross Unrealized Losses (154,564) (140,198)  
Fair Market Value $ 21,056,441 35,072,955  
Investment in affiliated entity (PLS)      
Available-for-sale Equity Securities [Abstract]      
Cost   0  
Gross Unrealized Gains   2,325,079  
Gross Unrealized Losses   0  
Fair Market Value   $ 2,325,079  
Maximum | US corporate debt securities      
Summary of investments      
Contractual maturity, less than 2 years 2 years