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Note 15 - Subsequent Events (Details Textual) - USD ($) |  |  |  | 1 Months Ended | 2 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2018 | May 15, 2018 | Mar. 06, 2018 | Jul. 31, 2018 | May 15, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Proceeds from Issuance of Common Stock |  |  |  |  |  | $ 150,000,000 | $ 52,467,336
Common Class A [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 3,137,768 | 3,300,000 |  |  |  |
Proceeds from Issuance of Common Stock |  | $ 73,110,000 | $ 76,890,000 |  | $ 150,000,000 |  |
Common Class A [Member] | Shelf Registration [Member] | Cowen and Company LLC [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  | 1,149,849 |
Proceeds from Issuance of Common Stock |  |  |  |  |  | $ 26,087,283 |
Common Class A [Member] | Subsequent Event [Member] | Shelf Registration [Member] | Cowen and Company LLC [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 28,080 |  |  |
Proceeds from Issuance of Common Stock |  |  |  | $ 590,844 |  |  |
Tammy Lynn Outdoor, LLC [Member] | Common Class A [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions | 85,170 |  |  |  |  |  |

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