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Note 9 - Fair Value - Fair Values for Investments (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Marketable equity securities, cost | $ 11,934,888 |  | $ 11,934,888 |  |
Marketable equity securities | 12,022,361 |  | 12,022,361 |  |
Marketable equity securities, realized gain (loss) |  |  | 415,572 |  |
Marketable equity securities |  |  | 87,473 |  |
Securities available for sale, realized gain (loss) |  |  | 4,276 |  |
Securities available for sale, gain (loss) |  |  | (36,957) |  |
Realized gain (loss) |  |  | 419,848 |  |
Gain (loss) | 126,621 | $ 206,306 | 50,516 | $ 113,303 |
Reported Value Measurement [Member] |  |  |  |  |
Marketable equity securities, cost | 12,022,361 |  | 12,022,361 |  |
Securities available for sale, cost | 85,019,145 |  | 85,019,145 |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Marketable equity securities | 12,022,361 |  | 12,022,361 |  |
Securities available for sale, cost | $ 85,019,145 |  | $ 85,019,145 |  |

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