Note 18 - Retirement Plans - Changes in the Fair Value of the Domestic Plan's Level 3 Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair value of plan assets, beginning of period	$ 39,135
Fair value of plan assets, end of period	39,524	$ 39,135
Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets, beginning of period	2,168
Fair value of plan assets, end of period	2,198	2,168
United States Pension Plan of US Entity [Member]
Fair value of plan assets, beginning of period	39,135	41,665
Actual return on plan assets	2,910	(806)
Fair value of plan assets, end of period	39,524	39,135
United States Pension Plan of US Entity [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets, beginning of period	2,168
Actual return on plan assets	30
Fair value of plan assets, end of period	$ 2,198	$ 2,168