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Note 6 - Long-term Debt (Details Textual) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Mar. 01, 2022 USD ($) | Apr. 08, 2021 USD ($) $ / shares shares | Mar. 31, 2022 USD ($) $ / shares | Mar. 31, 2021 USD ($) | Dec. 31, 2021 $ / shares
Stock Issued During Period, Shares, Issued for Commitment Fee (in shares) | shares |  | 80,000 |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  | $ 0.001 | $ 0.001 |  | $ 0.001
Repayments of Convertible Debt |  |  | $ 840,000 | $ (0) |
Convertible Debt [Member] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 15,000,000.0 |  |  |
Debt Instrument, Redemption Price, Percentage |  | 112.00% |  |  |
Debt Instrument, Convertible, Conversion Ratio |  | 0.1006749 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.00% |  |  |
Debt Conversion, Percent of Common Stock Price Value |  | 175.00% |  |  |
Debt Instrument, Periodic Payment, Principal | $ 840,000 |  |  |  |
Debt Instrument, Redemption Covenant, Floor Price (in dollars per share) | $ / shares |  | $ 1.75 |  |  |
Repayments of Convertible Debt |  |  | 840,000 |  |
Interest Expense, Debt, Total |  |  | 187,500 | 0 |
Amortization of Debt Issuance Costs |  |  | $ 297,338 | $ 0 |

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