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Note 2 - Basis of Presentation, Principles of Consolidation, and Significant Accounting Policies (Details Textual)
$ / shares in Units, $ in Thousands, shares in Millions
12 Months Ended
Mar. 22, 2024
$ / shares
Mar. 21, 2024
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.001 $ 0.001
Number of Operating Segments       1
Retained Earnings (Accumulated Deficit)     $ (131,604) $ (101,835)
Cash     $ 23,600  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares     0.5 0.4
AUSTRALIA        
Cash     $ 300  
General and Administrative Expense [Member]        
Legal Fees     $ 1,500 $ 2,400
Subsequent Event [Member]        
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.001      
Reverse Stock Split [Member] | Subsequent Event [Member]        
Stockholders' Equity Note, Stock Split, Conversion Ratio 15 15