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Note 9 - Fair Value - Fair Values for Investments (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Marketable equity securities, cost | $ 49,941,567 |  | $ 49,941,567 |  |
Marketable equity securities | 52,866,683 |  | 52,866,683 |  |
Marketable equity securities, realized gain (loss) |  |  | 415,572 |  |
Marketable equity securities |  |  | 2,925,116 |  |
Securities available for sale, realized gain (loss) |  |  | 14,902 |  |
Securities available for sale, gain (loss) |  |  | (61,056) |  |
Realized gain (loss) |  |  | 430,474 |  |
Gain (loss) | 2,813,544 | $ 13,419 | 2,864,060 | $ 126,722 |
Reported Value Measurement [Member] |  |  |  |  |
Marketable equity securities, cost | 52,866,683 |  | 52,866,683 |  |
U.S. Treasury notes, Fair Value | 75,095,227 |  | 75,095,227 |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Marketable equity securities | 52,866,683 |  | 52,866,683 |  |
U.S. Treasury notes, Fair Value | $ 75,095,227 |  | $ 75,095,227 |  |

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