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Investments in Securities and Fair Value Schedule of Carrying Value and Fair Value of Financial Assets (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financial Assets        
Cash and cash equivalents, carrying value $ 27,928,472 $ 21,790,068 $ 15,826,515 $ 23,626,761
Cost-basis investments, carrying value 4,244,402 3,588,314    
Accrued dividends and interest, carrying value 1,035,152 1,004,126    
Financial assets disclosed, carrying value 33,208,026 26,382,508    
Cash and cash equivalents, estimated fair value 27,928,472 21,790,068    
Cost-basis investments, estimated fair value 4,497,665 3,684,020    
Accrued dividends and interest, estimated fair value 1,035,152 1,004,126    
Financial assets disclosed, estimated fair value 33,461,289 26,478,214    
Level 1        
Financial Assets        
Cash and cash equivalents, estimated fair value 27,928,472 21,790,068    
Cost-basis investments, estimated fair value 0 0    
Accrued dividends and interest, estimated fair value 1,035,152 1,004,126    
Financial assets disclosed, estimated fair value 28,963,624 22,794,194    
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 4,497,665 3,684,020    
Accrued dividends and interest, estimated fair value 0 0    
Financial assets disclosed, estimated fair value $ 4,497,665 $ 3,684,020