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Note 5 - Disclosure of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Balance $ (7,102) $ (7,424) $ (9,502) $ (1,878)
Other comprehensive loss before reclassifications (13,132) 63 (10,732) (5,483)
Amounts reclassified from AOCL
Net current-period other comprehensive loss (13,132) 63 (10,732) (5,483)
Balance (20,234) (7,361) (20,234) (7,361)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance (11,362) (13,243) (11,362) (13,243)
Other comprehensive loss before reclassifications
Amounts reclassified from AOCL
Net current-period other comprehensive loss
Balance (11,362) (13,243) (11,362) (13,243)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]        
Balance (2,765) (1,918) (1,611) (646)
Other comprehensive loss before reclassifications (134) [1] 266 [2] (1,288) [3] (1,006) [4]
Amounts reclassified from AOCL
Net current-period other comprehensive loss (134) 266 (1,288) (1,006)
Balance (2,899) (1,652) (2,899) (1,652)
Balance (21,229) (22,585) (22,475) (15,767)
Other comprehensive loss before reclassifications (13,266) 329 (12,020) (6,489)
Amounts reclassified from AOCL
Net current-period other comprehensive loss (13,266) 329 (12,020) (6,489)
Balance $ (34,495) $ (22,256) $ (34,495) $ (22,256)
[1] Represents unrealized losses of $(219), net of tax benefit of $85 for the three months ended June 30, 2016.
[2] Represents unrealized gains of $431, net of tax effect of $(165) for the three months ended June 30, 2015.
[3] Represents unrealized losses of $(2,115), net of tax benefit of $827 for the six months ended June 30, 2016.
[4] Represents unrealized losses of $(1,643), net of tax benefit of $637 for the six months ended June 30, 2015.