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Note 5 - Accumulated Other Comprehensive Loss - Disclosure of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Ending Balance – June 30, 2017 $ (27,209)   $ (27,209)  
Beginning Balance – April 1, 2017     (40,163)  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Ending Balance – June 30, 2017 (15,857) $ (20,234) (15,857) $ (20,234)
Beginning Balance – April 1, 2017 (24,447) (7,102) (28,047) (9,502)
Other comprehensive income before reclassifications 8,590 (13,132) 12,190 (10,732)
Amounts reclassified from AOCL
Net current-period other comprehensive income 8,590 (13,132) 12,190 (10,732)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Ending Balance – June 30, 2017 (11,040) (11,362) (11,040) (11,362)
Beginning Balance – April 1, 2017 (11,040) (11,362) (11,040) (11,362)
Other comprehensive income before reclassifications
Amounts reclassified from AOCL
Net current-period other comprehensive income
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]        
Ending Balance – June 30, 2017 (312) (2,899) (312) (2,899)
Beginning Balance – April 1, 2017 (636) (2,765) (1,076) (1,611)
Other comprehensive income before reclassifications 324 [1] (134) [2] 764 [3] (1,288) [4]
Amounts reclassified from AOCL
Net current-period other comprehensive income 324 (134) 764 (1,288)
AOCI Attributable to Parent [Member]        
Ending Balance – June 30, 2017 (27,209) (34,495) (27,209) (34,495)
Beginning Balance – April 1, 2017 (36,123) (21,229) (40,163) (22,475)
Other comprehensive income before reclassifications 8,914 (13,266) 12,954 (12,020)
Amounts reclassified from AOCL
Net current-period other comprehensive income $ 8,914 $ (13,266) $ 12,954 $ (12,020)
[1] Represents unrealized gains of $531, net of tax effect of $(207) for the three months ended June 30, 2017.
[2] Represents unrealized losses of $(219), net of tax benefit of $85 for the three months ended June 30, 2016.
[3] Represents unrealized gains of $1,254, net of tax effect of $(490) for the six months ended June 30, 2017.
[4] Represents unrealized losses of $(2,115), net of tax benefit of $827 for the six months ended June 30, 2016.