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Note 5 - Accumulated Other Comprehensive Loss - Disclosure of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Beginning Balance $ (40,163)    
Other comprehensive loss 18,965 $ (17,688) $ (6,708)
Ending Balance (21,198) (40,163)  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]      
Beginning Balance (28,047) (9,502)  
Other comprehensive income (loss) before reclassifications 15,191 (18,545)  
Amounts reclassified from AOCL  
Other comprehensive loss 15,191 (18,545)  
Ending Balance (12,856) (28,047) (9,502)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Beginning Balance (11,040) (11,362)  
Other comprehensive income (loss) before reclassifications (591) [1] (273) [2]  
Amounts reclassified from AOCL 653 [3] 595 [4]  
Other comprehensive loss 62 322  
Ending Balance (10,978) (11,040) (11,362)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]      
Beginning Balance (1,076) (1,611)  
Other comprehensive income (loss) before reclassifications 3,712 [5] 535 [6]  
Amounts reclassified from AOCL  
Other comprehensive loss 3,712 535  
Ending Balance 2,636 (1,076) (1,611)
AOCI Attributable to Parent [Member]      
Beginning Balance (40,163) (22,475)  
Other comprehensive income (loss) before reclassifications 18,312 (18,283)  
Amounts reclassified from AOCL 653 595  
Other comprehensive loss 18,965 (17,688)  
Ending Balance $ (21,198) $ (40,163) $ (22,475)
[1] Represents unrecognized actuarial losses of $(800), net of tax benefit of $209, included in the computation of net periodic pension cost for the year ended December 31, 2017. Refer to Note 14, "Benefit Plans," to the consolidated financial statements for additional information.
[2] Represents unrecognized actuarial losses of $(412), net of tax benefit of $139, included in the computation of net periodic pension cost for the year ended December 31, 2016. Refer to Note 14, "Benefit Plans," to the consolidated financial statements for additional information.
[3] Represents actuarial losses of $883, net of tax effect of $(230), amortized to net periodic pension cost for the year ended December 31, 2017. Refer to Note 14, "Benefit Plans," to the consolidated financial statements for additional information.
[4] Represents actuarial losses of $941, net of tax effect of $(346), amortized to net periodic pension cost for the year ended December 31, 2016. Refer to Note 14, "Benefit Plans," to the consolidated financial statements for additional information.
[5] Represents unrealized gains of $6,096, net of tax effect of $(2,384) for the year ended December 31, 2017.
[6] Represents unrealized gains of $876, net of tax effect of $(341) for the year ended December 31, 2016.