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Note 11 - Capital Stock (Details Textual) - USD ($) |  |  | 2 Months Ended | 6 Months Ended | 16 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 15, 2018 | Mar. 06, 2018 | May 15, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018 | Aug. 03, 2018 | May 04, 2018 | Feb. 28, 2018 | Feb. 22, 2018
Proceeds from Issuance of Common Stock |  |  |  |  | $ 150,000,000 |  |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  | $ 450,515 | $ 1,522,194 |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  | 40,000,000 |  |
Preferred Stock, Shares Authorized |  |  |  | 1,000,000 |  | 1,000,000 | 1,000,000 |  | 1,000,000 |  |
Class of Warrant or Right, Outstanding |  |  |  | 105,556 |  | 105,556 | 105,556 |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Value, Available to Issue |  |  |  |  |  |  |  |  |  |  | $ 150,000,000
Sale of Stock, Price Per Share |  |  |  |  |  |  |  |  |  |  | $ 23.30
Share Price |  |  |  |  |  |  |  |  |  |  | $ 23.29
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 Stock, Shares Authorized |  |  |  | 38,838,884 |  | 38,838,884 | 38,838,884 |  | 38,838,884 |  |
Class of Warrant or Right, Outstanding |  |  |  | 784 |  | 784 |  |  |  |  |
Common Class A [Member] | Shelf Registration [Member] |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Shelf Registration, Value, Available to Issue |  |  |  |  |  |  |  |  |  | $ 200,000,000 |
Sale of Stock, Shelf Registration, Value, Incremental Amount Available to Issue |  |  |  |  |  |  |  |  |  | $ 50,000,000 |
Common Class A [Member] | Shelf Registration [Member] | Cowen and Company LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 589,997 |  | 1,789,226 |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  | $ 14,606,857 |  | $ 41,852,539 |  |  |  |  |
Compensation, Percentage of Common Stock Sales |  |  |  |  |  |  |  |  |  | 3.00% |
Proceeds from Issuance of Common Stock, Net |  |  |  | 14,156,342 |  |  |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  | $ 450,515 |  |  |  |  |  |  |
Common Class B [Member] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  | 1,161,116 |  | 1,161,116 | 1,161,116 |  | 1,161,116 |  |
Class of Warrant or Right, Outstanding |  |  |  | 105,556 |  | 105,556 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  | 784 |  |  |

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