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Note 15 - Employee Benefit Plans - Change in Value Related to Level 3 Assets (Details) - Foreign Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Plan assets, beginning of year $ 258,365 $ 239,281
Benefits paid (10,267) (8,552)
Actuarial gain (loss) 25,691 59,364
Translation adjustment 30,565 (36,719)
Plan assets, end of year 307,166 258,365
Fair Value, Inputs, Level 3 [Member]    
Plan assets, beginning of year 127,953  
Interest cost 2,633  
Benefits paid (3,728)  
Assets transferred in to (out of) Level 3 (2,089)  
Actuarial gain (loss) 8,753  
Translation adjustment 17,455  
Plan assets, end of year $ 150,977 $ 127,953