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Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Cash |  | $ 8,000 |  | $ 48,900
Cash and Cash Equivalents, at Carrying Value |  | 8,291 |  | $ 64,168
Proceeds from Warrant Exercises |  | 6,294 | $ 0 |
Second Amendment to 2020 KWH Loan [Member] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 10,000 |  |
Forecast [Member] |  |  |  |
Proceeds from Warrant Exercises | $ 16,000 |  |  |

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