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Note 4 - Debt - Carrying Amounts of Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Revolving credit facility $ 15,000 $ 112,500
Term loan 115,625 120,313
Entrusted loan 3,522
Unamortized debt issuance costs (3,432) (3,820)
Total debt 501,647 454,142
Less: Current maturities 9,375 6,250
Total long-term debt 492,272 447,892
Euro Senior Notes, Series A [Member]    
Senior Notes 137,670 122,313
Euro Senior Notes, Series B [Member]    
Senior Notes 111,784 99,314
U.S. Senior Notes, Series A [Member]    
Senior Notes 25,000
U.S. Senior Notes, Series B [Member]    
Senior Notes $ 100,000