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Note 11 - Capital Stock (Details Textual) - USD ($) |  |  | 2 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 15, 2018 | Mar. 06, 2018 | May 15, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | May 04, 2018 | Feb. 28, 2018 | Feb. 22, 2018 | Dec. 31, 2017
Proceeds from Issuance of Common Stock |  |  |  | $ 150,000,000 | $ 52,467,336 |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  | 40,000,000 |  |  |
Preferred Stock, Shares Authorized |  |  |  | 1,000,000 |  | 1,000,000 |  |  | 1,000,000
Class of Warrant or Right, Outstanding |  |  |  | 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
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 |  |  |  | 1,149,849 |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  | $ 26,087,283 |  |  |  |  |
Compensation, Percentage of Common Stock Sales |  |  |  |  |  |  | 3.00% |  |
Proceeds from Issuance of Common Stock, Net |  |  |  | $ 25,304,665 |  |  |  |  |
Common Class B [Member] |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  | 1,161,116 |  | 1,161,116 |  |  | 1,161,116
Class of Warrant or Right, Outstanding |  |  |  | 105,556 |  |  |  |  |

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