Note 7 - Common Stock (Tables)

9 Months Ended

Sep. 30, 2014

Stockholders' Equity Note [Abstract]

Common Stock Reserve for Future Issuance [Table Text Block]

	September 30, 2014		December 31, 2013
Conversion of Series A Preferred Stock		1,700,622		1,426,482
Conversion of Series A-1 Preferred Stock		838,101		687,395
Conversion of Series B Preferred Stock		1,610,383		1,307,771
Conversion of Series C Preferred Stock		1,361,809		1,105,907
Conversion of Series D Preferred Stock		3,327,894		-
Stock-based compensation awards		1,135,415		623,111
Warrants to purchase Common Stock		659,806		659,806
Total		10,634,030		5,810,472