Note 5 - Revenue - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue	$ 161,283	$ 110,223	$ 322,425	$ 225,318
Less: Warrant Contra Revenue	(730)		(730)
Net Revenue	160,553	110,223	321,695	225,318
Communications [Member]
Revenue	64,421	58,412	130,245	124,761
E-Commerce and Consumer [Member]
Revenue	24,375	7,950	48,719	16,063
Financial and Business Service [Member]
Revenue	13,245	12,941	26,565	28,182
Media [Member]
Revenue	23,587	2,691	45,344	6,008
Travel and Hospitality [Member]
Revenue	17,375	13,366	33,889	27,007
Health Care and Education [Member]
Revenue	8,352	2,301	18,881	4,945
Technology, IT and Related Service [Member]
Revenue	3,458	1,346	5,896	2,822
Other Sector [Member]
Revenue	$ 6,470	$ 11,216	$ 12,886	$ 15,530