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Note 2 - Basis of Presentation (Details Textual) - USD ($)
$ in Thousands
Jul. 26, 2023
Jun. 30, 2023
Dec. 31, 2022
Retained Earnings (Accumulated Deficit)   $ (631,453) $ (577,104)
Subsequent Event [Member]      
Proceeds from Issuance of Private Placement $ 120,000