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Note 6 - Accumulated Other Comprehensive Loss - Disclosure of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Balance $ 871,011 $ 617,255 $ 761,261 $ 554,320
Balance 939,215 698,635 939,215 698,635
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Balance (16,673) (17,335) (18,832) (12,856)
Other comprehensive loss before reclassifications (9,811) 5,717 (7,652) 1,238
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive loss (9,811) 5,717 (7,652) 1,238
Balance (26,484) (11,618) (26,484) (11,618)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance (10,541) (10,978) (10,541) (10,978)
Other comprehensive loss before reclassifications 0 0 0 0
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive loss 0 0 0 0
Balance (10,541) (10,978) (10,541) (10,978)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]        
Balance (6,617) 11,413 5,560 2,636
Other comprehensive loss before reclassifications (2,721) [1] 1,626 [2] (14,898) [3] 10,403 [4]
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive loss (2,721) 1,626 (14,898) 10,403
Balance (9,338) 13,039 (9,338) 13,039
AOCI Attributable to Parent [Member]        
Balance (33,831) (16,900) (23,813) (21,198)
Other comprehensive loss before reclassifications (12,532) 7,343 (22,550) 11,641
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive loss (12,532) 7,343 (22,550) 11,641
Balance $ (46,363) $ (9,557) $ (46,363) $ (9,557)
[1] Represents unrealized losses of $(3,677), net of tax effect of $956, for the three months ended September 30, 2019.
[2] Represents unrealized gains of $2,197, net of tax effect of $(571), for the three months ended September 30, 2018.
[3] Represents unrealized losses of $(20,132), net of tax effect of $5,234, for the nine months ended September 30, 2019.
[4] Represents unrealized gains of $14,057, net of tax effect of $(3,654), for the nine months ended September 30, 2018.