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Note 2 - Summary of Significant Accounting Policies - Equity Excluded From Calculation of Diluted Earnings Per Share (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Employee Stock Option [Member]      
Shares excluded (in shares) 11,845 8,435 7,918
Warrant [Member]      
Shares excluded (in shares) 600 3,565 4,108
Convertible Debt Securities [Member]      
Shares excluded (in shares) 7,521 7,087 6,677