Note 19 - Segment Information - Schedule of Reconciliation of Consolidated Operating Profit to Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Gross sales by segment
Total reported gross sales	$ 514,997	$ 525,936	$ 491,538
Operating profit/(loss) by segment
Total reported operating profit/(loss)	101,496	144,418	130,056
API [Member]
Gross sales by segment
Total reported gross sales	489,132	525,936	491,538
Operating profit/(loss) by segment
Total reported operating profit/(loss)	130,721	168,330	148,073
FDF [Member]
Gross sales by segment
Total reported gross sales	25,865
Operating profit/(loss) by segment
Total reported operating profit/(loss)	(605)
Total Segment [Member]
Operating profit/(loss) by segment
Total reported operating profit/(loss)	130,116	168,330	148,073
Corporate [Member]
Operating profit/(loss) by segment
Total reported operating profit/(loss)	$ (28,620)	$ (23,912)	$ (18,017)