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Note 12 - Subsequent Events (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2023 | Mar. 31, 2023 | Mar. 31, 2022
Proceeds from Issuance of Common Stock |  | $ 7,174 | $ 38,187
The 2021 Equity Distribution Agreement [Member] |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 605,848 | 250,171
Proceeds from Issuance of Common Stock |  | $ 7,200 | $ 3,900
Payments of Stock Issuance Costs |  | $ 200 | $ 100
Subsequent Event [Member] | The 2021 Equity Distribution Agreement [Member] |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 272,303 |  |
Proceeds from Issuance of Common Stock | $ 3,100 |  |
Payments of Stock Issuance Costs | $ 100 |  |

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