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Note 7 - Preferred Stock (Tables)
 12 Months Ended
Dec. 31, 2015
Notes Tables  
Allocation Of Net Proceeds From Preferred Stock Financing [Table Text Block]
Net proceeds
 
$
1,999,032
 
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
 
Initial carrying value of preferred stock
 
 
871,614
 
Accretion of beneficial conversion feature (deemed dividend) related to issuance of Series B Convertible Preferred Stock
 
 
360,229
 
Conversions to common stock during 2012, 2013, and 2014
 
 
(1,231,843
)
Carrying value at December 31, 2015 and 2014
 
$
-0-
  
Net proceeds
 
$
1,615,798
 
Beneficial conversion feature – Series A Preferred Stock (recorded to Additional Paid-in Capital)
 
 
(360,229
)
Beneficial conversion feature – Series B Preferred Stock (recorded to Additional Paid-in Capital)
 
 
(754,286
)
Net proceeds allocated to preferred stock
 
 
501,283
 
Accretion of beneficial conversion feature (deemed dividend)
 
 
754,286
 
Conversions to common stock during 2014
 
 
(1,179,474
)
Carrying value at December 31, 2015 and 2014
 
$
76,095
 
Net proceeds after transaction costs
 
$
2,679,810
 
Less: Fair value of warrants (recorded to Additional Paid-in Capital)
 
 
(1,695,869
)
Recorded value of Series C Preferred Stock at December 31, 2015
 
$
983,941