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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Finite-Lived Intangible Asset, Useful Life (Year) 12 years  
Impairment, Long-Lived Asset, Held-for-Use, Total $ 0  
Goodwill, Impairment Loss 0  
Liability for Uncertainty in Income Taxes, Noncurrent $ 0 $ 0
Number of Operating Segments 1  
Geographic Concentration Risk [Member] | Assets, Total [Member] | UNITED STATES    
Concentration Risk, Percentage 100.00% 100.00%
General and Administrative Expense [Member]    
Patent Costs $ 500 $ 500
Minimum [Member] | Equipment [Member]    
Property, Plant and Equipment, Useful Life (Year) 3 years  
Maximum [Member] | Equipment [Member]    
Property, Plant and Equipment, Useful Life (Year) 5 years