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Note 11 - Capital Stock (Details Textual) - USD ($) |  |  | 3 Months Ended | 4 Months Ended | 6 Months Ended | 8 Months Ended | 9 Months Ended | 18 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 02, 2020 | May 28, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2020 | Aug. 20, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Aug. 20, 2019 | Mar. 18, 2020 | Aug. 13, 2019 | Feb. 28, 2018
Proceeds from Issuance of Common Stock |  |  |  |  |  |  | $ 59,549,751 | $ 29,229,522 |  |  |  |
Payments of Stock Issuance Costs |  |  |  |  |  |  | $ 3,417,323 | $ 924,742 |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  | 105,556 | 105,556 |  |  | 105,556 |  |  |  |  |
Warrants for Common Class B Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  | 104,772 |  |  |  | 104,772 |  |  |  |  |
Warrants for Common Class A Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  | 784 |  |  |  | 784 |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  |  |  |  |  | 20,000,000 |  |
Stock Repurchased During Period, Shares (in shares) |  |  |  |  |  |  | 0 |  |  |  |  |
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
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 0 | 448,880 | 40,455 |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  | $ 9,450,789 | $ 669,751 |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Net |  |  |  | 9,122,227 |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  | $ 328,562 |  |  |  |  |  |  |  |
Common Class A [Member] | Shelf Registration [Member] | Cowen and Company LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Shelf Registration, Value, Available to Issue |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 |
Compensation, Percentage of Common Stock Sales |  |  |  |  |  |  |  |  |  |  | 3.00% | 3.00%
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  | 942,223 |  |  | 2,141,452 |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  | $ 22,753,943 |  |  | $ 49,999,625 |  |  |
Proceeds from Issuance of Common Stock, Net |  |  |  |  |  | 22,059,015 |  |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  |  |  | $ 694,928 |  |  |  |  |  |
Common Class A [Member] | Underwriting Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 3,680,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 58,900,000 |  |  |  |  |  |  |  |  |  |  |
Share Offering, Number of Shares Authorized (in shares) |  | 3,200,000 |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) |  | $ 16.00 |  |  |  |  |  |  |  |  |  |
Stock Option, Exercisable, Remaining Contractual Term (Day) |  | 30 days |  |  |  |  |  |  |  |  |  |
Stock Option, Number of Securities Called by Each Stock Option (in shares) |  | 480,000 |  |  |  |  |  |  |  |  |  |
Common Class A [Member] | Underwriting Agreement [Member] | Adam Peterson and Alex Rozek, a Board Member, and Employee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 39,375 |  |  |  |  |  |  |  |  |  |

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