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Note 9 - Fair Value - Fair Values for Investments (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Trading securities |  |  |  |  | $ 83,100,805
Trading securities, realized gain (loss) |  |  | 6,406 |  |
Trading securities, unrealized gain (loss) |  |  | (132,191) |  |
Securities available for sale, realized gain (loss) |  |  | 424,127 |  |
Securities available for sale, unrealized gain (loss) |  |  | 258,913 |  |
Realized gain (loss) |  |  | 430,533 |  |
Unrealized gain (loss) | 13,419 |  | 126,722 |  |
Reported Value Measurement [Member] |  |  |  |  |
Trading securities |  |  |  |  |
Securities available for sale | 98,799,898 |  | 98,799,898 |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Trading securities |  |  |  |  |
Securities available for sale | $ 98,799,898 |  | $ 98,799,898 |  |

X
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