Note 2 - Summary of Significant Accounting Policies (Details) - Stock-based Compensation - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Stock-based Compensation [Abstract]
Stock based compensation expense recognized	$ 441,000	$ 309,000
Number of unvested stock options (in Shares)	1,185,151	1,050,513
Fair value of unvested stock options	$ 1,908,205	$ 1,552,934
Amount remaining to be recognized as expense	$ 1,034,337	$ 812,979