Note 10 - Stockholders' Equity (Details) - Summary of Option Activity (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Summary of Option Activity [Abstract]
Number of Options	619,503	459,271
Weighted Average Exercise Price Per Share	$ 7.98	$ 8.95
Weighted Average Remaining Contractual Life (in years)	8 years 6 months
Vested and expected to vest at March 31, 2015	545,159
Vested and expected to vest at March 31, 2015	$ 7.35
Vested and expected to vest at March 31, 2015	8 years 146 days
Exercisable at March 31, 2015	304,654
Exercisable at March 31, 2015	$ 10.71
Exercisable at March 31, 2015	7 years 6 months
Granted	208,500
Granted	$ 5.47
Exercised	(321)
Exercised	$ 2.30
Cancelled/forfeited	(47,947)
Cancelled/forfeited	$ 6.35