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Investments (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Summary of investments    
Cost $ 84,620,013 $ 53,327,364
Gross Unrealized Gains 4,085 2,737
Gross Unrealized Losses (328,277) (254,127)
Fair Market Value 84,295,821 53,075,974
Mutual funds [Member]    
Summary of investments    
Cost 58,532,030 29,487,758
Gross Unrealized Gains 0 2,667
Gross Unrealized Losses (296,239) (216,790)
Fair Market Value 58,235,791 29,273,635
US corporate debt securities [Member]    
Summary of investments    
Cost 25,983,647 23,839,606
Gross Unrealized Gains 4,085 70
Gross Unrealized Losses (31,741) (37,337)
Fair Market Value 25,955,991 $ 23,802,339
Municipal bonds [Member]    
Summary of investments    
Cost 104,336  
Gross Unrealized Gains 0  
Gross Unrealized Losses (297)  
Fair Market Value $ 104,039  
Maximum [Member] | US corporate debt securities [Member]    
Summary of investments    
Contractual maturity, less than 2 years 2 years
Maximum [Member] | Municipal bonds [Member]    
Summary of investments    
Contractual maturity, less than 1 year