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Note 3 - Accounting Policies - Securities Excluded From Calculation of Diluted Earnings Per Share (Details) - shares
shares in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Employee Stock Option [Member]    
Antidilutive securities (in shares) 11,198 8,517
Warrant [Member]    
Antidilutive securities (in shares) 620 600
Convertible Debt Securities [Member]    
Antidilutive securities (in shares) 7,865 7,410