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Note 2 - Basis of Presentation, Principles of Consolidation, and Significant Accounting Policies and Liquidity (Details Textual)
$ in Thousands, shares in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 22, 2024
Mar. 21, 2024
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
Dec. 31, 2022
Dec. 31, 2023
USD ($)
Number of Operating Segments             1  
Retained Earnings (Accumulated Deficit)     $ (140,893)   $ (140,893)     $ (131,604)
Cash     $ 10,800   $ 10,800      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares     1.6   0.4      
General and Administrative Expense [Member]                
Legal Fees     $ 100 $ 400 $ 100 $ 900    
Reverse Stock Split [Member]                
Stockholders' Equity Note, Stock Split, Conversion Ratio 15 15