Note 9 - Fair Value Measurement - Fair Value of Liabilities Measured on a Recurring Basis (Details) - USD ($)		Jun. 30, 2016	[2]	Dec. 31, 2015	[3]
Conversion Feature Liability [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Liability fair value	[1]	$ 0		$ 0
Conversion Feature Liability [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Liability fair value	[1]	0		0
Conversion Feature Liability [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative Liability fair value	[1]	2,313,328		901,243
Conversion Feature Liability [Member]
Derivative Liability fair value	[1]	2,313,328		901,243
Warrant Liability [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Liability fair value	[1]	0		0
Warrant Liability [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Liability fair value	[1]	0		0
Warrant Liability [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative Liability fair value	[1]	3,812,690		1,914,923
Warrant Liability [Member]
Derivative Liability fair value	[1]	3,812,690		1,914,923
Fair Value, Inputs, Level 1 [Member]
Derivative Liability fair value	[1]	0		0
Fair Value, Inputs, Level 2 [Member]
Derivative Liability fair value	[1]	0		0
Fair Value, Inputs, Level 3 [Member]
Derivative Liability fair value	[1]	6,126,018		2,816,166
Derivative Liability fair value	[1]	$ 6,126,018		$ 2,816,166

[1] The fair value at the measurement date is equal to their carrying value on the balance sheet

[2] The fair value of the derivative instruments was estimated using the Income Approach and the Black Scholes option pricing model with the following assumptions for the period ended June 30, 2016

[3] The fair value of the derivative instruments was estimated using the Income Approach and the Black Scholes option pricing model with the following assumptions for the year ended December 31, 2015