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Note 6 - Accumulated Other Comprehensive Loss - Disclosure of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Beginning Balance $ 554,319  
Ending Balance 570,194  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Beginning Balance (12,856) $ (28,047)
Other comprehensive income (loss) before reclassifications 6,179 3,600
Amounts reclassified from AOCL
Other comprehensive loss 6,179 3,600
Ending Balance (6,677) (24,447)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Beginning Balance (10,978) (11,040)
Other comprehensive income (loss) before reclassifications
Amounts reclassified from AOCL
Other comprehensive loss
Ending Balance (10,978) (11,040)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Beginning Balance 2,636 (1,076)
Other comprehensive income (loss) before reclassifications 6,647 [1] 440 [2]
Amounts reclassified from AOCL
Other comprehensive loss 6,647 440
Ending Balance 9,283 (636)
AOCI Attributable to Parent [Member]    
Beginning Balance (21,198) (40,163)
Other comprehensive income (loss) before reclassifications 12,826 4,040
Amounts reclassified from AOCL
Other comprehensive loss 12,826 4,040
Ending Balance $ (8,372) $ (36,123)
[1] Represents unrealized gains of $8,982, net of tax effect of $(2,335) for the three months ended March 31, 2018.
[2] Represents unrealized gains of $723, net of tax effect of $(283) for the three months ended March 31, 2017.