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Note 12 - Significant Customers / Concentration (Details Textual) - Geographic Concentration Risk [Member] - Assets, Total [Member]
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
DENMARK    
Concentration Risk, Percentage 100.00% 91.00%
UNITED STATES    
Concentration Risk, Percentage 0.00% 9.00%