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Note 16 - Subsequent Events (Details Textual) - Senior Unsecured Convertible Notes [Member] - USD ($) $ / shares in Units, $ in Millions | Aug. 12, 2022 | Aug. 08, 2022 | Jul. 29, 2022 | May 20, 2022
--- | --- | --- | --- | ---
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 8.00%
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  |  |  | $ 3.33
Director [Member] | Subsequent Event [Member] | Conversion Price 6 Point 254, Maturity Date December 2028 [Member] |  |  |  |
Proceeds from Related Party Debt |  |  | $ 5 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.00% |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  |  | $ 6.254 |
Director [Member] | Subsequent Event [Member] | Conversion Price 6 Point 15, Maturity Date December 2028 [Member] |  |  |  |
Proceeds from Related Party Debt |  | $ 4 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.00% |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  | $ 6.254 |  |
Non-affiliated Party [Member] | Subsequent Event [Member] | Conversion Price 6 Point 254, Maturity Date December 2026 [Member] |  |  |  |
Proceeds from Related Party Debt | $ 10 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.00% |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ 6.15 |  |  |

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