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Note 7 - Common Stock (Tables)
6 Months Ended
Jun. 30, 2015
Stockholders' Equity Note [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
                   

Number of

 
                   

Shares

 
                   

Outstanding

 
   

Exercisable

 

Expiration

 

Exercise

   

Under

 

Issuance Date

 

for

 

Date

 

Price

   

Warrants

 
                         

September 2014

 

Common Shares

 

September 23, 2019

  $ 0.53       940,189  

September 2014

 

Common Shares

 

September 30, 2024

  $ 0.53       471,698  

October 2014

 

Common Shares

 

October 13, 2019

  $ 0.53       237,000  

October 2014

 

Common Shares

 

October 31, 2019

  $ 0.53       11,250  

November 2014

 

Common Shares

 

November 19, 2019

  $ 0.53       100,000  

February 2015

 

Common Shares

 

February 17, 2025

  $ 0.50       605,556  

March 2015

 

Common Shares

 

March 26, 2025

  $ 0.34       11,628  

May 2015

 

Common Shares

 

May 12, 2025

  $ 0.53       289,827  

May 2015

 

Common Shares

 

May 14, 2025

  $ 0.37       25,000  

May 2015

 

Common Shares

 

May 17, 2020

  $ 0.53       172,675  
                      2,864,823