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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, 2018
Sep. 30, 2017
Employee Stock Option [Member]    
Shares excluded (in shares) 12,300 11,198
Warrant [Member]    
Shares excluded (in shares) 640 620
Convertible Debt Securities [Member]    
Shares excluded (in shares) 8,348 7,865