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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Balance $ 809,955 $ 570,194 $ 761,261 $ 554,320
Balance 871,011 617,255 871,011 617,255
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Balance (19,765) (6,677) (18,832) (12,856)
Other comprehensive income (loss) before reclassifications 3,092 (10,658) 2,159 (4,479)
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive income (loss) 3,092 (10,658) 2,159 (4,479)
Balance (16,673) (17,335) (16,673) (17,335)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance (10,541) (10,978) (10,541) (10,978)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive income (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 436 9,283 5,560 2,636
Other comprehensive income (loss) before reclassifications (7,053) [1] 2,130 [2] (12,177) [3] 8,777 [4]
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive income (loss) (7,053) 2,130 (12,177) 8,777
Balance (6,617) 11,413 (6,617) 11,413
AOCI Attributable to Parent [Member]        
Balance (29,870) (8,372) (23,813) (21,198)
Other comprehensive income (loss) before reclassifications (3,961) (8,528) (10,018) 4,298
Amounts reclassified from AOCL 0 0 0 0
Net current-period other comprehensive income (loss) (3,961) (8,528) (10,018) 4,298
Balance $ (33,831) $ (16,900) $ (33,831) $ (16,900)
[1] Represents unrealized losses of $(9,531), net of tax effect of $2,478 for the three months ended June 30, 2019.
[2] Represents unrealized gains of $2,878, net of tax effect of $(748), for the three months ended June 30, 2018.
[3] Represents unrealized losses of $(16,455), net of tax effect of $4,278 for the six months ended June 30, 2019.
[4] Represents unrealized gains of $11,860, net of tax effect of $(3,083), for the six months ended June 30, 2018.