Note 13- Retirement Plans - Components of Net Periodic Benefit (Credit)/Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Domestic Pension Plan [Member]
Components of net periodic benefit (credit)/cost
Interest cost	$ 511	$ 553	$ 1,532	$ 1,661
Expected return on plan assets	(792)	(677)	(2,376)	(2,031)
Recognized actuarial loss	180	199	539	599
Net periodic benefit (credit)/cost	(101)	75	(305)	229
International Pension Plan [Member]
Components of net periodic benefit (credit)/cost
Service cost	245	247	768	700
Interest cost	176	192	552	545
Recognized actuarial loss	93	94	292	268
Amortization of prior service credit	(1)	(1)	(3)	(3)
Net periodic benefit (credit)/cost	$ 513	$ 532	$ 1,609	$ 1,510