Note 16 - Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Beginning balance	$ (55,449)	$ (44,981)
Other comprehensive (loss)/income before reclassifications	(10,949)	(13,554)
Amounts reclassified from accumulated other comprehensive loss	878	3,086
Net current-period other comprehensive income/(loss)	(10,071)	(10,468)	$ (26,019)
Ending balance	(65,520)	(55,449)	(44,981)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Beginning balance	(25,880)	(11,410)
Other comprehensive (loss)/income before reclassifications	(8,481)	(16,424)
Amounts reclassified from accumulated other comprehensive loss	71	1,954
Net current-period other comprehensive income/(loss)	(8,410)	(14,470)
Ending balance	(34,290)	(25,880)	(11,410)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Beginning balance	(29,569)	(33,378)
Other comprehensive (loss)/income before reclassifications	(2,468)	2,893
Amounts reclassified from accumulated other comprehensive loss	807	916
Net current-period other comprehensive income/(loss)	(1,661)	3,809
Ending balance	(31,230)	(29,569)	(33,378)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Beginning balance		(193)
Other comprehensive (loss)/income before reclassifications		(23)
Amounts reclassified from accumulated other comprehensive loss		216
Net current-period other comprehensive income/(loss)		193
Ending balance			$ (193)