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Note 7 - Preferred Stock (Tables)
 6 Months Ended
Jun. 30, 2015
Notes Tables  
Allocation Of Net Proceeds From Preferred Stock Financing [Table Text Block]
Net proceeds after transaction costs
   $ 2,679,809  
Less: Fair value of warrants (recorded to Additional Paid-in Capital)
     (1,695,868
)
Recorded value of Series C Preferred Shares at June 30, 2015
   $ 983,941