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CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Common shares, par value (in dollars per share) $ 0.001 $ 0.001
Common shares, authorized (in shares) 100,000,000 100,000,000
Common shares, issued (in shares) 70,258,415 68,109,287
Common shares, outstanding (in shares) 70,258,415 68,109,287