Note 7 - Common Stock (Details Textual) - $ / shares	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Oct. 27, 2014
The 2014 Employee Stock Purchase Plan [Member]
Stock Issued During Period, Shares, Employee Stock Purchase Plans	5,864	5,864
Common Stock, Shares, Outstanding	16,458,477	16,458,477	16,448,455
Common Stock, Shares Authorized	100,000,000	100,000,000	100,000,000
Common Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001	$ 0.001	$ 0.001
Common Stock, Shares, Issued	16,458,477	16,458,477	16,448,455