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Note 11 - Capital Stock (Details Textual) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 $ / shares shares | Dec. 08, 2022 USD ($) | Apr. 25, 2022 $ / shares shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  | $ 0.001
Offering of Debt Securities and Warrants, Maximum (in shares) |  |  |  | 500,000,000
Maximum Shares of Common Stock Registered by Certain Selling Shareholders (in shares) |  |  |  | 8,297,093
Stock Issued During Period, Value, New Issues | $ | $ 28,105,461 |  |  |
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 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 |  |  |
At The Market Offering [Member] | Common Class A [Member] |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 1,097,824 |  |  |
Stock Issued During Period, Value, New Issues | $ | $ 28,105,461 |  |  |
Commission, Percent of Gross Sales Price Per Share | 3.00% |  |  |
At The Market Offering [Member] | Common Class A [Member] | Maximum [Member] |  |  |  |
Equity Offering Program, Aggregate Share Price | $ | $ 100,000,000 |  | $ 100,000,000 |

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