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v3.19.1

Note 12 - Capital Stock (Details Textual) - USD ($) |  |  |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 15, 2018 | Mar. 06, 2018 | Jul. 18, 2017 | Jun. 22, 2017 | Jul. 18, 2017 | Jul. 18, 2017 | May 15, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Aug. 03, 2018 | May 04, 2018 | Feb. 28, 2018 | Feb. 22, 2018 | Jun. 15, 2017
Proceeds from Issuance of Common Stock |  |  |  |  |  |  |  | $ 150,000,000 | $ 52,467,336 |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  |  |  |  |  | $ 1,614,555 | $ 961,953 |  |  |  |  |
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 B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  | 1,161,116 | 1,161,116 |  | 1,161,116 |  |  |
Class of Warrant or Right, Outstanding |  |  |  |  |  |  |  | 104,772 |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  |  | 784 |  |  |  |
Common Class B [Member] | Prospectus Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Authorized to be Issued |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,538,462
Sale of Stock, Price Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13
Common Class B [Member] | Over-Allotment Option [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Authorized to be Issued |  |  |  |  |  |  |  |  |  |  |  |  |  | 980,769
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 23.30 |
Stock Issued During Period, Shares, New Issues | 3,137,768 | 3,300,000 |  | 7,113,462 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 73,110,000 | $ 76,890,000 |  | $ 88,139,834 |  |  | $ 150,000,000 |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Net |  |  | $ 4,254,229 |  |  | $ 91,432,110 |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs |  |  | $ 961,953 |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Value, Available to Issue |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |
Share Price |  |  |  |  |  |  |  |  |  |  |  |  | $ 23.29 |
Common Stock, Shares Authorized |  |  |  |  |  |  |  | 38,838,884 | 38,838,884 |  | 38,838,884 |  |  |
Class of Warrant or Right, Outstanding |  |  |  |  |  |  |  | 784 |  |  |  |  |  |
Common Class A [Member] | Two Major Controlling Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 3,653,846 |  |  |  |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  |  | $ 46,312,498 |  |  |  |  |  |  |  |  |  |
Common Class A [Member] | Officer and Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 509,085 |  |  |  |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  |  | $ 6,154,838 |  |  |  |  |  |  |  |  |  |
Common Class A [Member] | Prospectus Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 6,538,462 |  |  |  |  |  |  |  |  |  |
Common Class A [Member] | Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 351,880 | 575,000 | 926,880 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | 1,199,229 |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  |  |  | $ 27,245,682 |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Net |  |  |  |  |  |  |  | $ 26,428,311 |  |  |  |  |  |
Compensation, Percentage of Common Stock Sales |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |

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