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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) |

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