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Note 11 - Capital Stock (Details Textual) |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 06, 2021 USD ($) $ / shares shares | Jun. 02, 2020 USD ($) shares | May 28, 2020 $ / shares shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 $ / shares shares
Proceeds from Issuance of Common Stock | $ |  |  |  | $ 58,625,000 | $ 59,549,751 |
Payments of Stock Issuance Costs | $ |  |  |  | $ 3,447,996 | $ 3,417,323 |
Class of Warrant or Right, Outstanding (in shares) |  |  |  | 105,556 |  | 105,556
Warrants for Common Class B Stock [Member] |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  | 104,772 |  |
Warrants for Common Class A Stock [Member] |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  | 784 |  |
Common Class A [Member] |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  | $ 0.001 |  | $ 0.001
Common Stock, Voting Rights Per Share |  |  |  | 1 |  |
Common Class B [Member] |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  | $ 0.001 |  | $ 0.001
Common Stock, Voting Rights Per Share |  |  |  | 10 |  |
Underwriting Agreement [Member] | Common Class A [Member] |  |  |  |  |  |
Share Offering, Number of Shares Authorized (in shares) |  |  | 3,200,000 |  |  |
Share Price (in dollars per share) | $ / shares |  |  | $ 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 |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 3,680,000 |  |  |  |
Proceeds from Issuance of Common Stock | $ |  | $ 58,900,000 |  |  |  |
Underwriting Agreement [Member] | Common Class A [Member] | Adam Peterson and Alex Rozek, a Board Member, and Employee [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 39,375 |  |  |
Public Offering Including Over-allotment Option [Member] | Common Class A [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 2,645,000 |  |  |  |  |
Public Offering [Member] | Common Class A [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 2,345,000 |  |  |  |  |
Proceeds from Issuance of Common Stock | $ | $ 58,625,000 |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | $ 0.001 |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares | $ 25.00 |  |  |  |  |
Stock Sale Agreement, Percent of Gross Proceeds | 5.50% |  |  |  |  |
Proceeds from Issuance of Common Stock, Net | $ | $ 55,400,625 |  |  |  |  |
Payments of Stock Issuance Costs | $ | $ 133,169 |  |  |  |  |
Over-Allotment Option [Member] | Common Class A [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 345,000 |  |  |  |  |
Sold by Selling Stockholder [Member] | Common Class A [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 300,000 |  |  |  |  |

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