Investments In Securities Investments in Securities (Schedule of Carrying Value and Fair Value of Financial Assets Disclosed) (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash	$ 25,718,050	$ 27,928,472
Cost-basis investments	0	0
Accrued dividends and interest	1,336,998	1,035,152
Total	27,055,048	28,963,624
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash	0	0
Cost-basis investments	0	0
Accrued dividends and interest	0	0
Total	0	0
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash	0	0
Cost-basis investments	5,341,173	4,497,665
Accrued dividends and interest	0	0
Total	5,341,173	4,497,665
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash	25,718,050	27,928,472
Cost-basis investments	4,894,951	4,244,402
Accrued dividends and interest	1,336,998	1,035,152
Total	31,949,999	33,208,026
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash	25,718,050	27,928,472
Cost-basis investments	5,341,173	4,497,665
Accrued dividends and interest	1,336,998	1,035,152
Total	$ 32,396,221	$ 33,461,289