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Note 16 - Significant Customers / Concentration (Details Textual) - Geographic Concentration Risk [Member] - Assets, Total [Member]
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
DENMARK    
Concentration Risk, Percentage 98.00% 65.00%
UNITED STATES    
Concentration Risk, Percentage 0.00% 33.00%
CHINA    
Concentration Risk, Percentage 2.00% 2.00%