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Note 3 - Accounting Policies - Equity Excluded From Calculation of Diluted Earnings Per Share (Details) - shares
shares in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Employee Stock Option [Member]    
Shares excluded (in shares) 8,517 6,960
Warrant [Member]    
Shares excluded (in shares) 600 3,565
Convertible Debt Securities [Member]    
Shares excluded (in shares) 7,410 6,982