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Note 12 - Significant Customers and Concentrations (Details Textual) - Geographic Concentration Risk [Member] - Assets, Total [Member]
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
DENMARK    
Concentration Risk, Percentage 97.00% 98.00%
UNITED STATES    
Concentration Risk, Percentage 1.00% 0.00%
CHINA    
Concentration Risk, Percentage 2.00% 2.00%