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Consolidated Balance Sheets (Parentheticals) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Statement Of Financial Position [Abstract]    
Preferred stock, par value $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 342,219us-gaap_PreferredStockSharesIssued 376,387us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 342,219us-gaap_PreferredStockSharesOutstanding 376,387us-gaap_PreferredStockSharesOutstanding
Common stock, par value $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 65,000,000us-gaap_CommonStockSharesAuthorized 65,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 35,015,322us-gaap_CommonStockSharesIssued 21,148,862us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 35,015,322us-gaap_CommonStockSharesOutstanding 21,148,862us-gaap_CommonStockSharesOutstanding