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Note 6 - Accumulated Other Comprehensive Loss - Disclosure of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Balance $ 1,390,204 $ 1,032,851 $ 761,261
Net current-period other comprehensive income (loss) (20,501) (9,337) (1,104)
Balance 2,214,087 1,390,204 1,032,851
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]      
Balance (11,674) (16,622)  
Other comprehensive income (loss) before reclassifications (41,030) [1] 4,948  
Net current-period other comprehensive income (loss) (41,030) 4,948  
Balance (52,704) (11,674) (16,622)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]      
Balance (22,580) (8,295)  
Other comprehensive income (loss) before reclassifications 20,529 [2] (14,285) [3]  
Net current-period other comprehensive income (loss) 20,529 (14,285)  
Balance (2,051) (22,580) (8,295)
AOCI Attributable to Parent [Member]      
Balance (34,254) (24,917) (23,813)
Other comprehensive income (loss) before reclassifications (20,501) (9,337)  
Amounts reclassified from AOCL 0    
Net current-period other comprehensive income (loss) (20,501) (9,337)  
Balance $ (54,755) $ (34,254) $ (24,917)
[1] Represents unfavorable impact from the strengthening of the U.S. dollar against foreign currencies during the year ended December 31, 2021, particularly the Euro and British Pound.
[2] Represents unrealized gains of $27,462 on the interest rate swaps, net of tax effect of $(6,933) for the year ended December 31, 2021.
[3] Represents unrealized losses of $(19,111) on the interest rate swaps, net of tax effect of $4,826 for the year ended December 31, 2020.