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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Convertible Preferred Stock [Member] | Series A-1 Shares [Member]    
Preferred stock, shares authorized (in shares) 100,000 100,000
Preferred stock, liquidation value $ 100 $ 100
Preferred stock, shares issued (in shares) 90,000 90,000
Preferred stock, shares outstanding (in shares) 90,000 90,000
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Convertible Preferred Stock [Member] | Series B-1 Shares [Member]    
Preferred stock, shares authorized (in shares) 105,000 105,000
Preferred stock, liquidation value $ 100 $ 100
Preferred stock, shares issued (in shares) 105,000 105,000
Preferred stock, shares outstanding (in shares) 105,000 105,000
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Allowance for doubtful accounts $ 13,785 $ 13,785
Preferred stock, shares authorized (in shares) 5,000,000  
Preferred stock, par value (in dollars per share) $ 0.0001  
Common stock, shares authorized (in shares) 170,000,000 170,000,000
Common stock, shares issued (in shares) 66,339,655 66,098,482
Common stock, shares outstanding (in shares) 66,339,655 66,098,482
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001