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Note 9 - Fair Value - Fair Values for Investments (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Marketable equity securities, cost | $ 5,521,241 |  |
Marketable equity securities | 5,477,223 |  |
Marketable equity securities, realized gain (loss) | 120,584 |  |
Marketable equity securities | (44,018) |  |
Securities available for sale, realized gain (loss) |  |  |
Securities available for sale, gain (loss) | (32,087) |  |
Realized gain (loss) | 120,584 |  |
Gain (loss) | (76,105) | $ (93,003) |
Reported Value Measurement [Member] |  |  |
Marketable equity securities, cost | 5,477,223 |  |
U.S. Treasury notes, Fair Value | 87,513,353 |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Marketable equity securities | 5,477,223 |  |
U.S. Treasury notes, Fair Value | $ 87,513,353 |  |

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