Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Stockholders' Equity- Stock-based Compensation Expense (Details)

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Note 8 - Stockholders' Equity- Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Stock-based compensation $ 561 $ 25 $ 599 $ 637
Research and Development Expense [Member]        
Stock-based compensation 144 8 150 297
General and Administrative Expense [Member]        
Stock-based compensation $ 417 $ 17 $ 449 $ 340