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Note 5 - Stockholders' Equity - BSM Option Valuation Model Assumptions (Details)
Feb. 20, 2015
$ / shares
Warrant [Member] | Public Offering [Member]  
Fair value of underlying common stock (in dollars per share) $ 2.57
Exercise price (in dollars per share) $ 3.50
Risk-free interest rate 1.61%
Volatility 65.50%
Dividend yield 0.00%
Contractual term (in years) 5 years
Weighted-average measurement date fair value per share (in dollars per share) $ 1.23
Public Offering [Member] | Underwriter Options [Member]  
Fair value of underlying common stock (in dollars per share) 2.62
Exercise price (in dollars per share) $ 2.60
Risk-free interest rate 0.02%
Volatility 73.00%
Dividend yield 0.00%
Contractual term (in years) 43 days
Weighted-average measurement date fair value per share (in dollars per share) $ 0.27
Fair value of underlying common stock (in dollars per share) $ 2.80