Quarterly report pursuant to Section 13 or 15(d)

Note 1 - The Company and Basis of Presentation (Details Textual)

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Note 1 - The Company and Basis of Presentation (Details Textual) - USD ($)
6 Months Ended
Mar. 22, 2017
Jun. 17, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
May 10, 2016
Proceeds from Issuance of Common Stock     $ 31,440,000 $ 13,857,000    
Common Stock, Par or Stated Value Per Share     $ 0.0001   $ 0.0001 $ 0.0001
March 2017 Offering [Member]            
Proceeds From Issuance of Common Stock, Net $ 31,440,000          
Stock Issued During Period, Shares, New Issues 8,625,000          
Share Price $ 4          
Proceeds from Issuance of Common Stock $ 34,500,000          
June 2016 Offering [Member]            
Proceeds From Issuance of Common Stock, Net   $ 13,886,000        
Stock Issued During Period, Shares, New Issues   3,105,000        
Share Price   $ 5        
Proceeds from Issuance of Common Stock   $ 15,525,000