Note 3 - Fair Value Measurements (Details) - Summary of the Valuation Techniques for Fair Value of Preferred Stock Warrant Liabilities (USD $)	12 Months Ended
	Dec. 31, 2013		Sep. 23, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 30, 2013
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Preferred stock warrant liabilities	$ 623,672	[1]		$ 580,187	$ 602,188	$ 623,672
	$ 0.06		$ 0.53
	76.00%
Preferred Stock Warrant Liabilities [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Preferred stock warrant liabilities	$ 623,672
Minimum [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
	$ 0.04
	70.62%
Maximum [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
	$ 0.44
	84.23%

[1] The balance sheet as of December 31, 2013 has been derived from the audited financial statements at that date.