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Note 8 - Investments, Including Investments Accounted for Using the Equity Method (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Investment [Table Text Block] |
|  | December 31,
|  | 2018 |  | 2017
Certificates of deposit |  | $ | 1,378,666 |  |  | $ | 746,219 |
U.S. Treasury notes and corporate bond |  |  | 4,872,398 |  |  |  | 809,184 |
Convertible note receivable |  |  | - |  |  |  | 103,896 |
Total |  | $ | 6,251,064 |  |  | $ | 1,659,299 |
|  | December 31,
|  | 2018 |  | 2017
U.S. Treasury securities, held to maturity |  | $ | 2,902,004 |  |  | $ | 2,820,855 |
Certificates of deposit |  |  | 317,178 |  |  |  | 1,080,426 |
Preferred stock |  |  | 104,019 |  |  |  | - |
Non-voting common units of Dream Finders Holdings, LLC |  |  | 10,000,000 |  |  |  | 10,000,000 |
Voting common stock of CB&T Holding Corporation |  |  | 19,058,485 |  |  |  | - |
Total |  | $ | 32,381,686 |  |  | $ | 13,901,281 |
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] |
|  |  |  |  |  | Gross |  |  |  |
|  |  |  |  |  | Unrealized |  | Fair
|  | Cost |  | Gain |  | Value
U.S. Treasury bills, December 31, 2018 |  | $ | - |  |  | $ | - |  |  | $ | - |
U.S. Treasury bills, December 31, 2017 |  | $ | 82,968,614 |  |  | $ | 132,191 |  |  | $ | 83,100,805 |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  |  |  |  |  | Gross |  |  |  |
|  |  |  |  |  | Unrealized |  | Fair
|  | Cost |  | Gain |  | Value
U.S. Treasury notes, December 31, 2018 |  | $ | 86,728,590 |  |  | $ | 116,796 |  |  | $ | 86,845,386 |
Investments in and Advances to Affiliates [Table Text Block] |
|  | December 31,
|  | 2018 |  | 2017
Beginning of period |  | $ | 952,128 |  |  | $ | 871,918 |
Additional investment in unconsolidated affiliate |  |  | 40,399 |  |  |  | 66,000 |
Distributions received |  |  | (816,201 | ) |  |  | (59,550 | )
Loss on investment in affiliate |  |  | (107,630 | ) |  |  | - |
Equity in income of unconsolidated affiliates |  |  | 500,017 |  |  |  | 73,760 |
End of period |  | $ | 568,713 |  |  | $ | 952,128 |

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