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Note 11 - Non-vested Options (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Non-vested at January 1, 2015 (in shares) | 2,038,064 |
Non-vested at January 1, 2015 (in dollars per share) | $ 11.48 |
Granted (in shares) | 484,838 |
Granted (in dollars per share) | $ 11.27 | $ 15.86
Vested (in shares) | (592,529) |
Vested (in dollars per share) | $ 8.63 |
Forfeited (in shares) | (10,500) |
Forfeited (in dollars per share) | $ 13.57 |
Non-vested at December 31, 2015 (in shares) | 1,919,873 | 2,038,064
Non-vested at December 31, 2015 (in dollars per share) | $ 12.30 | $ 11.48

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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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X
- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + 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 Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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