Note 8 - Common Stock (Details Textual)	3 Months Ended	12 Months Ended
	Dec. 31, 2015 $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 $ / shares shares	Oct. 27, 2014 $ / shares
The 2014 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	1,768	7,632
Common stock, shares issued (in shares)	16,501,500	16,501,500	16,448,455
Dividends, Common Stock | $		$ 0
Common stock, shares authorized (in shares)	100,000,000	100,000,000	100,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001	$ 0.001	$ 0.001
Common stock, shares outstanding (in shares)	16,501,500	16,501,500	16,448,455
Number of Voting Rights for Each Common Stock Held		1