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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Stock-based compensation $ 27 $ 43 $ 38 $ 612
Research and Development Expense [Member]        
Stock-based compensation 6 18 6 289
General and Administrative Expense [Member]        
Stock-based compensation $ 21 $ 25 $ 32 $ 323