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Note 5 - Stockholders' Equity - Share Repurchases Under Authorizations (Details) - $ / shares | 9 Months Ended | 68 Months Ended
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Sep. 30, 2016 | Sep. 30, 2016
2011 Share Repurchase Authorization [Member] |  |
Shares repurchases under authorizations (in shares) | 599,123 | 2,327,636
Average price of share repurchases under authorizations (in dollars per share) | $ 79.21 | $ 51.09
The 2016 Stock Repurchase Authorization [Member] |  |
Shares repurchases under authorizations (in shares) | 666,475 | 666,475
Average price of share repurchases under authorizations (in dollars per share) | $ 78.90 | $ 78.90

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + 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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- Details
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