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Note 8 - Stockholders' Equity - Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Shares repurchased in association with tax withholdings on the vesting of RSUs (in shares) | 94,826 | 77,649 | 106,772
Common Class A [Member] |  |  |
Shares repurchased pursuant to repurchase authorizations (in shares) | 1,312,848 | 228,737 | 226,729
Average purchase price per share (in dollars per share) | $ 79.50 | $ 107.88 | $ 70.52
Total purchase price (in thousands) | $ 104,370 | $ 24,676 | $ 15,990
The 2011 Stock Repurchase Authorization [Member] | Common Class A [Member] |  |  |
Shares repurchased pursuant to repurchase authorizations (in shares) | 599,123 |  |
Average purchase price per share (in dollars per share) | $ 79.21 |  |
Cumulative repurchases, shares (in shares) | 2,327,636 |  |
Cumulative repurchases, average price (in dollars per share) | $ 51.09 |  |
The 2016 Stock Repurchase Authorization [Member] | Common Class A [Member] |  |  |
Shares repurchased pursuant to repurchase authorizations (in shares) | 713,725 |  |
Average purchase price per share (in dollars per share) | $ 79.74 |  |
Cumulative repurchases, shares (in shares) | 713,725 |  |
Cumulative repurchases, average price (in dollars per share) | $ 79.74 |  |

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- Definition Number of cumulative shares that have been repurchased and retired during the period. + References No definition available. + Details
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- Definition Represents information about average purchase price per share of cumulative stock repurchased and retired during the period. + References No definition available. + Details
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- Definition Represents the average purchase price per share for stocks repurchased and retired during the period. + References No definition available. + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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