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Note 7 - Preferred Stock (Tables)
3 Months Ended
Mar. 31, 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 March 31, 2015
  $ 983,941