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Note 11 - Shareholders' Equity - Schedule of Shareholders' Equity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Balance $ 1,083,421,000 $ 1,066,928,000 $ 1,031,669,000 $ 1,040,373,000 $ 1,066,928,000 $ 1,040,373,000
Stock options exercised and stock awards 1,745,000 1,231,000 1,184,000 766,000    
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan 4,258,000 8,836,000 5,949,000 7,893,000    
Vesting of restricted share awards (517,000) (2,315,000) (128,000) (1,619,000)    
Issuance of common stock under employee stock purchase plan 0 1,681,000   1,354,000    
Common stock repurchases (12,062,000) (26,048,000) (7,985,000) (38,137,000)    
Foreign currency translation adjustment (505,000) 384,000        
Net income 41,621,000 37,104,000 29,389,000 21,039,000 78,725,000 50,428,000
Balance 1,113,524,000 1,083,421,000 1,060,078,000 1,031,669,000 1,113,524,000 1,060,078,000
Common Class A [Member]            
Dividend (3,387,000) (3,389,000)        
Common Class B [Member]            
Dividend (1,050,000) (991,000)        
Common Stock Outstanding [Member]            
Balance 462,000 458,000 457,000 454,000 458,000 454,000
Stock options exercised and stock awards 0 1,000 0 0    
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan 0 0 0 0    
Vesting of restricted share awards 0 2,000 0 2,000    
Issuance of common stock under employee stock purchase plan 0 1,000   1,000    
Common stock repurchases 0 0 0 0    
Dividend 0 0        
Foreign currency translation adjustment 0 0        
Net income 0 0 0 0    
Balance $ 462,000 $ 462,000 $ 457,000 $ 457,000 $ 462,000 $ 457,000
Common Stock Outstanding [Member] | Common Class A [Member]            
Balance (in shares) 28,187,000 28,710,000 30,583,000 31,345,000 28,710,000 31,345,000
Stock options exercised and stock awards (in shares) 87,000 59,000 64,000 30,000    
Vesting of restricted share awards (in shares)   0 0 1,000    
Issuance of common stock under employee stock purchase plan (in shares)   57,000   41,000    
Common stock repurchases (in shares) (251,000) (639,000) 0 (834,000)    
Balance (in shares) 28,023,000 28,187,000 30,647,000 30,583,000 28,023,000 30,647,000
Common Stock Outstanding [Member] | Common Class B [Member]            
Balance (in shares) 8,463,000 8,290,000 8,623,000 8,469,000 8,290,000 8,469,000
Stock options exercised and stock awards (in shares) 0 0 0 0    
Vesting of restricted share awards (in shares)   226,000 1,000 226,000    
Issuance of common stock under employee stock purchase plan (in shares)   0   0    
Common stock repurchases (in shares) (67,000) (53,000) (194,000) (72,000)    
Balance (in shares) 8,396,000 8,463,000 8,430,000 8,623,000 8,396,000 8,430,000
Additional Paid-in Capital [Member]            
Balance $ 379,454,000 $ 370,025,000 $ 356,435,000 $ 348,044,000 $ 370,025,000 $ 348,044,000
Stock options exercised and stock awards 1,745,000 1,230,000 1,184,000 766,000    
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan 4,258,000 8,836,000 5,949,000 7,893,000    
Vesting of restricted share awards (517,000) (2,317,000) (128,000) (1,621,000)    
Issuance of common stock under employee stock purchase plan 0 1,680,000   1,353,000    
Common stock repurchases 0 0 0 0    
Dividend 0 0        
Foreign currency translation adjustment 0 0        
Net income 0 0 0 0    
Balance 384,940,000 379,454,000 363,440,000 356,435,000 384,940,000 363,440,000
Treasury Stock [Member]            
Balance (271,890,000) (245,842,000) (158,819,000) (120,682,000) (245,842,000) (120,682,000)
Stock options exercised and stock awards 0 0 0 0    
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan 0 0 0 0    
Vesting of restricted share awards 0 0 0 0    
Issuance of common stock under employee stock purchase plan 0 0   0    
Common stock repurchases (12,062,000) (26,048,000) (7,985,000) (38,137,000)    
Dividend 0 0        
Foreign currency translation adjustment 0 0        
Net income 0 0 0 0    
Balance (283,952,000) (271,890,000) (166,804,000) (158,819,000) (283,952,000) (166,804,000)
Retained Earnings [Member]            
Balance 975,011,000 942,287,000 833,596,000 812,557,000 942,287,000 812,557,000
Stock options exercised and stock awards 0 0 0 0    
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan 0 0 0 0    
Vesting of restricted share awards 0 0 0 0    
Issuance of common stock under employee stock purchase plan 0 0   0    
Common stock repurchases 0 0 0 0    
Foreign currency translation adjustment 0 0        
Net income 41,621,000 37,104,000 29,389,000 21,039,000    
Balance 1,012,195,000 975,011,000 $ 862,985,000 $ 833,596,000 1,012,195,000 $ 862,985,000
Retained Earnings [Member] | Common Class A [Member]            
Dividend (3,387,000) (3,389,000)        
Retained Earnings [Member] | Common Class B [Member]            
Dividend (1,050,000) (991,000)        
AOCI Attributable to Parent [Member]            
Balance 384,000 0     0  
Stock options exercised and stock awards 0 0        
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan 0 0        
Vesting of restricted share awards 0 0        
Issuance of common stock under employee stock purchase plan 0 0        
Common stock repurchases 0 0        
Dividend 0 0        
Foreign currency translation adjustment (505,000) 384,000        
Net income 0 0        
Balance $ (121,000) $ 384,000     $ (121,000)