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Note 2 - Summary of Significant Accounting Policies - Securities Excluded From Calculation of Diluted Earnings Per Share (Details) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Employee Stock Option [Member] |  |  |
Shares excluded (in shares) | 13,463 | 11,845 | 8,435
Warrant [Member] |  |  |
Shares excluded (in shares) | 620 | 600 | 3,565
Convertible Debt Securities [Member] |  |  |
Shares excluded (in shares) | 7,983 | 7,521 | 7,087

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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