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Note 11 - Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Schedule of Stockholders Equity [Table Text Block] |
|  | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Accumulated |  |  |  |  |
|  | Shares Outstanding |  |  | $0.01 Par |  |  | Additional Paid-In |  |  | Treasury |  |  | Retained |  |  | Other Comprehensive |  |  |  |  |
(in thousands) |  | Class A |  |  | Class B |  |  | Value |  |  | Capital |  |  | Stock |  |  | Earnings |  |  | Income |  |  | Total |
Balance, December 31, 201 8 |  |  | 28,710 |  |  |  | 8,290 |  |  | $ | 458 |  |  | $ | 370,025 |  |  | $ | (245,842 | ) |  | $ | 942,287 |  |  | $ | - |  |  | $ | 1,066,928 |
Stock options exercised and stock awards |  |  | 59 |  |  |  | – |  |  |  | 1 |  |  |  | 1,230 |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 1,231 |
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 8,836 |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 8,836 |
Vesting of restricted share awards |  |  | – |  |  |  | 226 |  |  |  | 2 |  |  |  | (2,317 | ) |  |  | – |  |  |  | – |  |  |  | – |  |  |  | (2,315 | )
Issuance of common stock under employee stock purchase plan |  |  | 57 |  |  |  | – |  |  |  | 1 |  |  |  | 1,680 |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 1,681 |
Common stock repurchases |  |  | (639 | ) |  |  | (53 | ) |  |  | – |  |  |  | – |  |  |  | (26,048 | ) |  |  | – |  |  |  | – |  |  |  | (26,048 | )
Dividend Class A common stock |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | (3,389 | ) |  |  | – |  |  |  | (3,389 | )
Dividend Class B common stock |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | (991 | ) |  |  | – |  |  |  | (991 | )
Other comprehensive income |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 384 |  |  |  | 384 |
Net income |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 37,104 |  |  |  | – |  |  |  | 37,104 |
Balance, March 31, 2019 |  |  | 28,187 |  |  |  | 8,463 |  |  | $ | 462 |  |  | $ | 379,454 |  |  | $ | (271,890 | ) |  | $ | 975,011 |  |  | $ | 384 |  |  | $ | 1,083,421 |
Stock options exercised and stock awards |  |  | 87 |  |  |  | – |  |  |  | – |  |  |  | 1,745 |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 1,745 |
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 4,258 |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 4,258 |
Vesting of restricted share awards |  |  | – |  |  |  | – |  |  |  | – |  |  |  | (517 | ) |  |  | – |  |  |  | – |  |  |  | – |  |  |  | (517 | )
Issuance of common stock under employee stock purchase plan |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |
Common stock repurchases |  |  | (251 | ) |  |  | (67 | ) |  |  | – |  |  |  | – |  |  |  | (12,062 | ) |  |  | – |  |  |  | – |  |  |  | (12,062 | )
Dividend Class A common stock |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | (3,387 | ) |  |  | – |  |  |  | (3,387 | )
Dividend Class B common stock |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | (1,050 | ) |  |  | – |  |  |  | (1,050 | )
Other comprehensive income |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | (505 | ) |  |  | (505 | )
Net income |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 41,621 |  |  |  | – |  |  |  | 41,621 |
Balance, June 30, 2019 |  |  | 28,023 |  |  |  | 8,396 |  |  | $ | 462 |  |  | $ | 384,940 |  |  | $ | (283,952 | ) |  | $ | 1,012,195 |  |  | $ | (121 | ) |  | $ | 1,113,524 |
|  | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Shares Outstanding |  |  | $0.01 Par |  |  | Additional Paid-In |  |  | Treasury |  |  | Retained |  |  |  |  |
(in thousands) |  | Class A |  |  | Class B |  |  | Value |  |  | Capital |  |  | Stock |  |  | Earnings |  |  | Total |
Balance, December 31, 201 7 |  |  | 31,345 |  |  |  | 8,469 |  |  | $ | 454 |  |  | $ | 348,044 |  |  | $ | (120,682 | ) |  | $ | 812,557 |  |  | $ | 1,040,373 |
Stock options exercised and stock awards |  |  | 30 |  |  |  | – |  |  |  | – |  |  |  | 766 |  |  |  | – |  |  |  | – |  |  |  | 766 |
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 7,893 |  |  |  | – |  |  |  | – |  |  |  | 7,893 |
Vesting of restricted share awards |  |  | 1 |  |  |  | 226 |  |  |  | 2 |  |  |  | (1,621 | ) |  |  | – |  |  |  | – |  |  |  | (1,619 | )
Issuance of common stock under employee stock purchase plan |  |  | 41 |  |  |  | – |  |  |  | 1 |  |  |  | 1,353 |  |  |  | – |  |  |  | – |  |  |  | 1,354 |
Common stock repurchases |  |  | (834 | ) |  |  | (72 | ) |  |  | – |  |  |  | – |  |  |  | (38,137 | ) |  |  | – |  |  |  | (38,137 | )
Net income |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 21,039 |  |  |  | 21,039 |
Balance, March 31, 2018 |  |  | 30,583 |  |  |  | 8,623 |  |  | $ | 457 |  |  | $ | 356,435 |  |  | $ | (158,819 | ) |  | $ | 833,596 |  |  | $ | 1,031,669 |
Stock options exercised and stock awards |  |  | 64 |  |  |  | – |  |  |  | – |  |  |  | 1,184 |  |  |  | – |  |  |  | – |  |  |  | 1,184 |
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 5,949 |  |  |  | – |  |  |  | – |  |  |  | 5,949 |
Vesting of restricted share awards |  |  | – |  |  |  | 1 |  |  |  | – |  |  |  | (128 | ) |  |  | – |  |  |  | – |  |  |  | (128 | )
Common stock repurchases |  |  | – |  |  |  | (194 | ) |  |  | – |  |  |  | – |  |  |  | (7,985 | ) |  |  | – |  |  |  | (7,985 | )
Net income |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | – |  |  |  | 29,389 |  |  |  | 29,389 |
Balance, June 30, 2018 |  |  | 30,647 |  |  |  | 8,430 |  |  | $ | 457 |  |  | $ | 363,440 |  |  | $ | (166,804 | ) |  | $ | 862,985 |  |  | $ | 1,060,078 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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