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Note 8 - Significant Customers / Concentration / Disaggregated Revenue (Details Textual)
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Customer Concentration Risk [Member] | Revenue Benchmark [Member]    
Number of Major Customers 4 1
Concentration Risk, Percentage 74.00% 12.00%
Geographic Concentration Risk [Member] | Assets, Total [Member] | DENMARK    
Concentration Risk, Percentage 92.00% 90.00%
Geographic Concentration Risk [Member] | Assets, Total [Member] | UNITED STATES    
Concentration Risk, Percentage 8.00% 10.00%