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Note 11 - Significant Customers / Concentration / Disaggregated Revenue (Details Textual) - Geographic Concentration Risk [Member] - Assets, Total [Member]
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
DENMARK    
Concentration Risk, Percentage 62.00% 61.00%
UNITED STATES    
Concentration Risk, Percentage 36.00% 26.00%
CHINA    
Concentration Risk, Percentage 2.00% 13.00%