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Note 1 - The Company and Basis of Presentation (Details Textual) - USD ($)
9 Months Ended
Jun. 17, 2016
Sep. 30, 2016
Sep. 30, 2015
May 09, 2016
Dec. 31, 2015
June 2016 Offering [Member]          
Stock Issued During Period, Shares, New Issues 3,105,000        
Share Price $ 5        
Proceeds from Issuance of Common Stock $ 15,525,000        
Proceeds From Issuance of Common Stock, Net $ 13,886,000        
Proceeds from Issuance of Common Stock   $ 13,886,000 $ 11,040,000    
Common Stock, Par or Stated Value Per Share   $ 0.0001   $ 0.0001 $ 0