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Note 5 - Accumulated Other Comprehensive Loss - Disclosure of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Balance $ (20,234) $ (7,361) $ (9,502) $ (1,878)
Other comprehensive gain (loss) before reclassifications (315) (1,072) (11,047) (6,555)
Amounts reclassified from AOCL
Net current-period other comprehensive income (loss) (315) (1,072) (11,047) (6,555)
Balance (20,549) (8,433) (20,549) (8,433)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance (11,362) (13,243) (11,362) (13,243)
Other comprehensive gain (loss) before reclassifications
Amounts reclassified from AOCL
Net current-period other comprehensive income (loss)
Balance (11,362) (13,243) (11,362) (13,243)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]        
Balance (2,899) (1,652) (1,611) (646)
Other comprehensive gain (loss) before reclassifications 779 [1] (1,065) [2] (509) [3] (2,071) [4]
Amounts reclassified from AOCL
Net current-period other comprehensive income (loss) 779 (1,065) (509) (2,071)
Balance (2,120) (2,717) (2,120) (2,717)
Balance (34,495) (22,256) (22,475) (15,767)
Other comprehensive gain (loss) before reclassifications 464 (2,137) (11,556) (8,626)
Amounts reclassified from AOCL
Net current-period other comprehensive income (loss) 464 (2,137) (11,556) (8,626)
Balance $ (34,031) $ (24,393) $ (34,031) $ (24,393)
[1] Represents unrealized gains of $1,279, net of tax effect of $(500) for the three months ended September 30, 2016.
[2] Represents unrealized losses of $(1,727), net of tax benefit of $662 for the three months ended September 30, 2015.
[3] Represents unrealized losses of $(836), net of tax benefit of $327 for the nine months ended September 30, 2016.
[4] Represents unrealized losses of $(3,370), net of tax benefit of $1,299 for the nine months ended September 30, 2015.