Note 5 - Accumulated Other Comprehensive Loss - Disclosure of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Balance	$ (40,163)
Balance	(36,123)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(28,047)	$ (9,502)
Other comprehensive income before reclassifications	3,600	2,400
Amounts reclassified from AOCL
Net current-period other comprehensive income	3,600	2,400
Balance	(24,447)	(7,102)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(11,040)	(11,362)
Other comprehensive income before reclassifications
Amounts reclassified from AOCL
Net current-period other comprehensive income
Balance	(11,040)	(11,362)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Balance	(1,076)	(1,611)
Other comprehensive income before reclassifications	440	(1,154)
Amounts reclassified from AOCL
Net current-period other comprehensive income	440	(1,154)
Balance	(636)	(2,765)
AOCI Attributable to Parent [Member]
Balance	(40,163)	(22,475)
Other comprehensive income before reclassifications	4,040	1,246
Amounts reclassified from AOCL
Net current-period other comprehensive income	4,040	1,246
Balance	$ (36,123)	$ (21,229)