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Note 15 - Common Stock Purchase Agreement (Details Textual) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 08, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Common Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 0.001 | $ 0.001
Stock Issued During Period, Value, New Issues |  | $ 2,037,000 |
Registration Rights Agreement [Member] |  |  |
Common Stock, Maximum Shares Sold (in shares) | 4,500,000 |  |
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] |  |  |
Purchase Agreement, Maximum Amount to be Sold | $ 15,000,000 |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 0 |
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Registration Rights Agreement [Member] |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 119,780 |  |
Stock Issued During Period, Value, New Issues | $ 150,000 |  |

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