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Note 9 - Fair Value - Fair Values for Investments (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Realized gains and (losses) |  |  | $ 3,666,081 |
Total changes in fair values included in current period earnings (loss) | $ (487,365) | $ 126,621 | (25,232,878) | $ 50,516
Reported Value Measurement [Member] |  |  |  |
Marketable equity securities, securities available for sale and corporate bonds | 129,987,859 |  | 129,987,859 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Marketable equity securities, securities available for sale and corporate bonds | $ 129,987,859 |  | $ 129,987,859 |

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- Definition Amount of realized gain (loss) on investment in debt and equity securities. + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) on investment in debt and equity securities. + References No definition available. + Details
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- Definition Cost of investment in debt investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value. + References No definition available. + Details
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