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Note 10 - Revenue - Cost of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Cost of Goods and Services Sold, Total $ 55,105 $ 60,731 [1] $ 178,578 $ 169,488 [1]
Network, other costs 2,315 2,461 [1] 7,590 7,064 [1]
Cost of revenues 59,258 64,514 [1] 191,363 180,015 [1]
Network Expenses [Member]        
Network, other costs 2,315 2,461 7,590 7,064
Network, depreciation and amortization costs 1,838 1,322 5,195 3,463
Cost of revenues 4,153 3,783 12,785 10,527
Network Access Services [Member]        
Cost of Goods and Services Sold, Total 12,271 12,960 37,746 35,000
Network, other costs 479 445 1,609 1,398
Cost of revenues 13,787 13,994 42,151 37,927
Network Access Services [Member] | Mobile Services [Member]        
Cost of Goods and Services Sold, Total 11,399 12,365 34,643 32,634
Network Access Services [Member] | Other Services [Member]        
Cost of Goods and Services Sold, Total 872 595 3,103 2,366
Domain Name Services [Member]        
Cost of Goods and Services Sold, Total 42,834 47,771 140,832 134,488
Network, other costs 1,836 2,016 5,981 5,666
Cost of revenues 45,471 50,520 149,212 142,088
Domain Name Services [Member] | Wholesale [Member]        
Cost of Goods and Services Sold, Total 38,221 42,980 126,984 121,085
Domain Name Services [Member] | Retail Services [Member]        
Cost of Goods and Services Sold, Total 4,465 4,611 13,320 12,776
Domain Name Services [Member] | Portfolio [Member]        
Cost of Goods and Services Sold, Total 148 180 528 627
Domain Name Services [Member] | Domain Services [Member] | Wholesale [Member]        
Cost of Goods and Services Sold, Total 37,414 42,293 124,572 119,207
Domain Name Services [Member] | Value Added Services [Member] | Wholesale [Member]        
Cost of Goods and Services Sold, Total $ 807 $ 687 $ 2,412 $ 1,878
[1] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.