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Note 13 - Segment and Geographic Distribution of Operations - Comparison of Total Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Total assets $ 1,151,733 $ 1,251,177 $ 1,251,177
Operating Segments [Member] | Americas [Member]      
Total assets 312,520   338,649
Operating Segments [Member] | Middle East and Asia Pacific [Member]      
Total assets 196,231   226,422
Operating Segments [Member] | Europe and Mediterranean [Member]      
Total assets 287,808   302,214
Operating Segments [Member] | West Africa [Member]      
Total assets 237,227   242,825
Corporate, Non-Segment [Member]      
Total assets $ 117,947   $ 141,067