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Note 3 - Equity Excluded From Calculation of Diluted Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Employee Stock Option [Member]    
Shares excluded (in shares) 8,961 7,293
Warrant [Member]    
Shares excluded (in shares) 3,565 3,843
Convertible Debt Securities [Member]    
Shares excluded (in shares) 7,193 6,777