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Note 6 - Changes in the Number and Weighted-Average Grant-Date Fair Value (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2015 $ / shares shares
Non-vested stock option awards (in shares) | shares | 4,385
Weighted average grant-date fair value (in dollars per share) | $ / shares | $ 4.27
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares | 2,217
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares | $ 7.72
Stock option awards vested (in shares) | shares | (1,711)
Stock option awards vested (in dollars per share) | $ / shares | $ 2.63
Stock option awards forfeited (in shares) | shares | (28)
Stock option awards forfeited (in dollars per share) | $ / shares | $ 6.39
Non-vested stock option awards (in shares) | shares | 4,863
Weighted average grant-date fair value (in dollars per share) | $ / shares | $ 6.40

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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