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Note 9 - Significant Customers / Concentration / Disaggregated Revenue (Details Textual) - Geographic Concentration Risk [Member] - Assets, Total [Member]
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
DENMARK    
Concentration Risk, Percentage 99.00% 100.00%
UNITED STATES    
Concentration Risk, Percentage 1.00% 0.00%