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Note 3 - Accounting Policies - Equity Excluded From Calculation of Diluted Earnings Per Share (Details) - shares
shares in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Employee Stock Option [Member]    
Shares excluded (in shares) 11,966 8,747
Warrant [Member]    
Shares excluded (in shares) 625 600
Convertible Debt Securities [Member]    
Shares excluded (in shares) 7,749 7,301