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Note 14 - Issuances of Common Stock (Details Textual) - At-the-market Sales Agreement [Member] - USD ($)
shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Aug. 11, 2023
Equity Offering, Maximum Amount     $ 25
Stock Issued During Period, Shares, New Issues (in shares) 0 0