Note 8 - Warrants to Purchase Common Stock (Details) (USD $)	3 Months Ended
	Mar. 31, 2014
Option outstanding, Begining balance	8,315,958
Option Granted	1,134,000
Option Exercised
Option Cancelled	(1,758,185)
Option outstanding, Ending balance	7,691,773
Options exercisable at End	5,470,227
Outstanding at Beginning, Weighted-Average Exercise Price	$ 0.42
Weighted- Average Exercise Price, Granted	$ 0.26
Weighted- Average Exercise Price, Exercised
Weighted- Average Exercise Price, Cancelled	$ 0.55
Outstanding at Ending, , Weighted-Average Exercise Price	$ 0.37
Weighted- Average exercisable at End	$ 0.40
Weighted- Average Remaining Contractual Term, Beginning balance	9 years 1 month 2 days
Weighted- Average Remaining Contractual Term, Granted	9 years 9 months 26 days
Weighted- Average Remaining Contractual Term, Ending Balance	8 years 9 months 26 days
Weighted- Average Remaining Contractual Term, exercisable at End	8 years 11 months 19 days
Warrant [Member]
Option outstanding, Begining balance	10,486,066
Option Granted	502,900
Option Exercised
Option Cancelled	(17,900)
Option outstanding, Ending balance	10,971,066
Options exercisable at End	10,971,066
Outstanding at Beginning, Weighted-Average Exercise Price	$ 1.25
Weighted- Average Exercise Price, Granted	$ 0.80
Weighted- Average Exercise Price, Exercised
Weighted- Average Exercise Price, Cancelled	$ 3
Outstanding at Ending, , Weighted-Average Exercise Price	$ 0.98
Weighted- Average exercisable at End	$ 0.98
Weighted- Average Remaining Contractual Term, Beginning balance	2 years 1 month 24 days
Weighted- Average Remaining Contractual Term, Granted	4 years 26 days
Weighted- Average Remaining Contractual Term, Ending Balance	1 year 3 months
Weighted- Average Remaining Contractual Term, exercisable at End	1 year 3 months