Note 15 - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Beginning balance	$ (11,410)	$ 9,990
Other comprehensive (loss)/income before reclassifications	(16,424)	(25,800)
Amounts reclassified from accumulated other comprehensive loss	1,954	4,400
Net current-period other comprehensive income/(loss)	(14,470)	(21,400)
Ending balance	(25,880)	(11,410)	$ 9,990
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Beginning balance	(193)	(396)
Other comprehensive (loss)/income before reclassifications	(23)	(99)
Amounts reclassified from accumulated other comprehensive loss	216	302
Net current-period other comprehensive income/(loss)	193	203
Ending balance	0	(193)	(396)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Beginning balance	(33,378)	(28,556)
Other comprehensive (loss)/income before reclassifications	2,893	(12,566)
Amounts reclassified from accumulated other comprehensive loss	916	7,744
Net current-period other comprehensive income/(loss)	3,809	(4,822)
Ending balance	(29,569)	(33,378)	(28,556)
Beginning balance	(44,981)	(18,962)
Other comprehensive (loss)/income before reclassifications	(13,554)	(38,465)
Amounts reclassified from accumulated other comprehensive loss	3,086	12,446
Net current-period other comprehensive income/(loss)	(10,468)	(26,019)	15,129
Ending balance	$ (55,449)	$ (44,981)	$ (18,962)