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Investments in Securities and Fair Value Schedule of Carrying Value and Fair Value of Financial Assets (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financial Assets        
Cash and cash equivalents, carrying value $ 21,790,068 $ 15,826,515 $ 23,626,761 $ 20,810,018
Cost-basis investments, carrying value 3,588,314 2,516,608    
Accrued dividends and interest, carrying value 1,004,126 1,063,837    
Financial assets disclosed, carrying value 26,382,508 19,406,960    
Cash and cash equivalents, estimated fair value 21,790,068 15,826,515    
Cost-basis investments, estimated fair value 3,684,020 2,675,817    
Accrued dividends and interest, estimated fair value 1,004,126 1,063,837    
Financial assets disclosed, estimated fair value 26,478,214 19,566,169    
Level 1        
Financial Assets        
Cash and cash equivalents, estimated fair value 21,790,068 15,826,515    
Cost-basis investments, estimated fair value 0 0    
Accrued dividends and interest, estimated fair value 1,004,126 1,063,837    
Financial assets disclosed, estimated fair value 22,794,194 16,890,352    
Level 2        
Financial Assets        
Cash and cash equivalents, estimated fair value 0 0    
Cost-basis investments, estimated fair value 0 0    
Accrued dividends and interest, estimated fair value 0 0    
Financial assets disclosed, estimated fair value 0 0    
Level 3        
Financial Assets        
Cash and cash equivalents, estimated fair value 0 0    
Cost-basis investments, estimated fair value 3,684,020 2,675,817    
Accrued dividends and interest, estimated fair value 0 0    
Financial assets disclosed, estimated fair value $ 3,684,020 $ 2,675,817