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Note 7 - Allocation of Net Proceeds from Preferred Stock Financing (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
Series A Convertible Preferred Stock [Member] | Gross Proceeds [Member]  
Net proceeds $ 1,999,032
Series A Convertible Preferred Stock [Member] | Series B Beneficial Conversion Feature [Member]  
Accretion of beneficial conversion feature (deemed dividend) 360,229
Series A Convertible Preferred Stock [Member] | Initial Carrying Value [Member]  
Value of preferred stock 871,614
Series A Convertible Preferred Stock [Member]  
Fair value of warrants (recorded to Additional Paid-in Capital) (1,127,418)
Beneficial conversion feature (recorded to Additional Paid-in Capital) (762,667)
Net proceeds allocated to preferred stock 108,947
Accretion of beneficial conversion feature (deemed dividend) 762,667
Value of preferred stock 0
Conversions to common stock (1,231,843)
Series B Convertible Preferred Stock [Member] | Gross Proceeds [Member]  
Net proceeds 1,615,798
Series B Convertible Preferred Stock [Member] | Series A Beneficial Conversion Feature [Member]  
Beneficial conversion feature (recorded to Additional Paid-in Capital) (360,229)
Series B Convertible Preferred Stock [Member] | Series B Beneficial Conversion Feature [Member]  
Beneficial conversion feature (recorded to Additional Paid-in Capital) (754,286)
Series B Convertible Preferred Stock [Member]  
Net proceeds allocated to preferred stock 501,283
Accretion of beneficial conversion feature (deemed dividend) 754,286
Value of preferred stock 76,095
Conversions to common stock (1,179,474)
Series C Convertible Preferred Stock [Member]  
Net proceeds 2,679,810
Fair value of warrants (recorded to Additional Paid-in Capital) (1,695,869)
Value of preferred stock 983,941
Net proceeds $ 2,679,810