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Note 3 - Accounting Policies - Equity Excluded From Calculation of Diluted Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Employee Stock Option [Member]    
Shares excluded (in shares) 11,849 8,961
Warrant [Member]    
Shares excluded (in shares) 625 3,565
Convertible Debt Securities [Member]    
Shares excluded (in shares) 7,634 7,193