Note 6 - Common Stock (Details Textual) - $ / shares	3 Months Ended	9 Months Ended
	Jun. 30, 2015	Sep. 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, Issued		16,479,508	16,448,455
Common Stock, Shares Authorized		100,000,000	100,000,000
Common Stock, Par or Stated Value Per Share		$ 0.001	$ 0.001	$ 0.001
Common Stock, Shares, Outstanding		16,479,508	16,448,455