Note 15 - Segment Information - Schedule of Reconciliation of Consolidated Operating Profit to Income Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net revenue by segment
Total reported net revenue	$ 176,850	$ 152,046	$ 336,306	$ 293,143
Operating profit/(loss) by segment
Total reported operating profit/(loss)	32,893	44,652	53,217	75,033
DS [Member]
Net revenue by segment
Total reported net revenue	128,968	145,987	241,028	282,595
Operating profit/(loss) by segment
Total reported operating profit/(loss)	39,138	48,939	70,319	84,305
DP [Member]
Net revenue by segment
Total reported net revenue	24,358		48,842
Operating profit/(loss) by segment
Total reported operating profit/(loss)	(371)		(621)
ESDT [Member]
Net revenue by segment
Total reported net revenue	23,524	6,059	46,436	10,548
Operating profit/(loss) by segment
Total reported operating profit/(loss)	(1,978)	578	(4,495)	178
Total Segment [Member]
Operating profit/(loss) by segment
Total reported operating profit/(loss)	36,789	49,517	65,203	84,483
Corporate [Member]
Operating profit/(loss) by segment
Total reported operating profit/(loss)	$ (3,896)	$ (4,865)	$ (11,986)	$ (9,450)