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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parenthetical) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Common stock, par value $ 0.001 $ 0.001
Common stock, authorized 50,000,000 50,000,000
Common stock, issued 38,779,710 27,554,076
Common stock, outstanding 38,779,710 27,554,076