Note 4 - Revenue - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue	$ 167,641	$ 189,436	$ 334,958	$ 352,931
Revenue	167,641	189,436	334,958	352,931
Warrant adjustment	0	(405)	0	(830)
Net revenue	167,641	189,031	334,958	352,101
Communications [Member]
Revenue	60,694	53,611	116,746	105,285
Revenue	60,694	53,611	116,746	105,285
E-Commerce and Consumer [Member]
Revenue	18,851	26,221	39,377	52,324
Revenue	18,851	26,221	39,377	52,324
Media [Member]
Revenue	15,927	23,778	32,869	49,572
Revenue	15,927	23,778	32,869	49,572
Financial and Business Service [Member]
Revenue	17,605	15,763	34,300	31,214
Revenue	17,605	15,763	34,300	31,214
Travel and Hospitality [Member]
Revenue	13,495	10,542	27,010	21,039
Revenue	13,495	10,542	27,010	21,039
Health Care and Education [Member]
Revenue	7,363	40,018	18,826	57,705
Revenue	7,363	40,018	18,826	57,705
Technology, IT and Related Service [Member]
Revenue	5,112	4,858	10,457	9,939
Revenue	5,112	4,858	10,457	9,939
Other Sector [Member]
Revenue	28,594	14,645	55,373	25,853
Revenue	$ 28,594	$ 14,645	$ 55,373	$ 25,853