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Investments In Securities Investments in Securities (Schedule of Carrying Value and Fair Value of Financial Assets Disclosed) (Details) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash | $ 30,890,785 | $ 27,928,472
Cost-basis investments | 0 | 0
Accrued dividends and interest | 1,323,598 | 1,035,152
Total | 32,214,383 | 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 | 5,698,667 | 4,497,665
Accrued dividends and interest | 0 | 0
Total | 5,698,667 | 4,497,665
Reported Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash | 30,890,785 | 27,928,472
Cost-basis investments | 5,342,495 | 4,244,402
Accrued dividends and interest | 1,323,598 | 1,035,152
Total | 37,556,878 | 33,208,026
Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash | 30,890,785 | 27,928,472
Cost-basis investments | 5,698,667 | 4,497,665
Accrued dividends and interest | 1,323,598 | 1,035,152
Total | $ 37,913,050 | $ 33,461,289

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value portion of investments accounted under the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75030709&loc=d3e39828-111592 + Details
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