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Investments in Securities and Fair Value Schedule of Carrying Value and Fair Value of Financial Assets (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Financial Assets |  |  |  |
Cash and cash equivalents, carrying value | $ 20,214,468 | $ 27,928,472 | $ 21,790,068 | $ 15,826,515
Cost-basis investments, carrying value | 5,438,745 | 4,244,402 |  |
Accrued dividends and interest, carrying value | 1,099,879 | 1,035,152 |  |
Financial assets disclosed, carrying value | 26,753,092 | 33,208,026 |  |
Cash and cash equivalents, estimated fair value | 20,214,468 | 27,928,472 |  |
Cost-basis investments, estimated fair value | 5,710,184 | 4,497,665 |  |
Accrued dividends and interest, estimated fair value | 1,099,879 | 1,035,152 |  |
Financial assets disclosed, estimated fair value | 27,024,531 | 33,461,289 |  |
Level 1 |  |  |  |
Financial Assets |  |  |  |
Cash and cash equivalents, estimated fair value | 20,214,468 | 27,928,472 |  |
Cost-basis investments, estimated fair value | 0 | 0 |  |
Accrued dividends and interest, estimated fair value | 1,099,879 | 1,035,152 |  |
Financial assets disclosed, estimated fair value | 21,314,347 | 28,963,624 |  |
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 | 5,710,184 | 4,497,665 |  |
Accrued dividends and interest, estimated fair value | 0 | 0 |  |
Financial assets disclosed, estimated fair value | $ 5,710,184 | $ 4,497,665 |  |

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- Definition Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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