Note 8 - Summary of Stock Options - Summary of Options Outstanding and Exercisable (Details)	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Range One [Member]
(in dollars per share)	$ 0.33
(in dollars per share)
(in shares) | shares	100,000
(in dollars per share)	$ 0.33
	9 years 226 days
(in shares) | shares
Range Two [Member]
(in dollars per share)
(in dollars per share)	$ 0.47
(in shares) | shares	635,000
(in dollars per share)	$ 0.47
	9 years 131 days
(in shares) | shares
$0.46 (in dollars per share)	$ 0.46
Range Three [Member]
(in dollars per share)	$ 0.60
(in dollars per share)
(in shares) | shares	1,881,476
(in dollars per share)	$ 0.60
	9 years
(in shares) | shares	475,203
(in dollars per share)	$ 0.60
Range Four [Member]
(in dollars per share)
(in dollars per share)	$ 0.99
(in shares) | shares	347,000
(in dollars per share)	$ 0.96
	9 years 310 days
(in shares) | shares
$0.46 (in dollars per share)	$ 0.89
Range Five [Member]
(in dollars per share)	$ 1.24
(in dollars per share)
(in shares) | shares	312,373
(in dollars per share)	$ 1.24
	7 years 54 days
(in shares) | shares	312,373
(in dollars per share)	$ 1.24
Range Six [Member]
(in dollars per share)
(in dollars per share)	$ 9
(in shares) | shares	57,603
(in dollars per share)	$ 8.64
	2 years 29 days
(in shares) | shares	57,603
$0.46 (in dollars per share)	$ 7
(in dollars per share)	$ 8.64
Range Seven [Member]
(in dollars per share)
(in dollars per share)	$ 18.63
(in shares) | shares	19,081
(in dollars per share)	$ 15.29
	2 years 208 days
(in shares) | shares	19,081
$0.46 (in dollars per share)	$ 12
(in dollars per share)	15.29
Range Eight [Member]
(in dollars per share)	$ 37
(in dollars per share)
(in shares) | shares	250
(in dollars per share)	$ 37
	1 year 357 days
(in shares) | shares	250
(in dollars per share)	$ 37
(in dollars per share)
(in dollars per share)
(in shares) | shares	3,352,783
(in dollars per share)	$ 0.89
	8 years 306 days
(in shares) | shares	864,510
(in dollars per share)	$ 1.70