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Note 9 - Fair Value - Fair Values for Investments (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Marketable equity securities, Cost | $ 49,554,926 |
Marketable equity securities, realized gain (loss) | 550,130 |
Marketable equity securities, gain (loss) | 6,353,001 |
Securities available for sale, realized gain (loss) | 14,902 |
Securities available for sale, gain (loss) | (79,664) |
Realized gain (loss) | 565,032 |
Gain (loss) | 6,273,337 | $ (15,395)
Reported Value Measurement [Member] |  |
Marketable equity securities, Cost | 55,907,927 |
U.S. Treasury notes, Fair Value | 75,409,199 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Marketable equity securities, Cost | 55,907,927 |
U.S. Treasury notes, Fair Value | $ 75,409,199 |

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