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Note 5 - Disclosure of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Beginning Balance $ (9,502) $ (1,878)
Other comprehensive income (loss) before reclassifications 2,400 (5,546)
Net current-period other comprehensive income (loss) 2,400 (5,546)
Ending Balance (7,102) (7,424)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Beginning Balance (11,362) (13,243)
Ending Balance (11,362) (13,243)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Beginning Balance (1,611) (646)
Other comprehensive income (loss) before reclassifications (1,154) [1] (1,272) [2]
Net current-period other comprehensive income (loss) (1,154) (1,272)
Ending Balance (2,765) (1,918)
Beginning Balance (22,475) (15,767)
Other comprehensive income (loss) before reclassifications 1,246 (6,818)
Net current-period other comprehensive income (loss) 1,246 (6,818)
Ending Balance $ (21,229) $ (22,585)
[1] Represents unrealized losses of $(1,896), net of tax benefit of $742 for the three months ended March 31, 2016.
[2] Represents unrealized losses of $(2,074), net of tax benefit of $802 for the three months ended March 31, 2015.