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Note 8 - Convertible Note Payable (Details Textual) | Mar. 01, 2022 USD ($) | Apr. 09, 2021 shares | Mar. 24, 2021 USD ($) $ / shares shares | Dec. 31, 2021
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Stock Issued During Period, Shares, Issued for Commitment Fee (in shares) | shares |  | 80,000 | 80,000 |
Convertible Debt [Member] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 15,000,000.0 |
Debt Instrument, Redemption Price, Percentage |  |  | 112.00% |
Debt Instrument, Convertible, Conversion Ratio |  |  | 100.6749 |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  |  | 175.00% |
Debt Instrument, Convertible, Threshold Consecutive Trading Days |  |  | 12 |
Debt Instrument, Redemption Covenant, Floor Price (in dollars per share) | $ / shares |  |  | $ 1.75 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.00%
Convertible Debt [Member] | Forecast [Member] |  |  |  |
Debt Instrument, Periodic Payment, Principal | $ 840,000 |  |  |
Debt Instrument, Convertible, Threshold Trading Days | 10 |  |  |

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