Note 6 - Common Stock

3 Months Ended

Mar. 31, 2015

Stockholders' Equity Note [Abstract]

Stockholders' Equity Note Disclosure [Text Block]

6. Common Stock

At March 31, 2015, the Company has 100,000,000 shares of Common Stock authorized for issuance, $0.001 par value per share, of which 16,448,691 shares were issued and outstanding.  The Company has the following shares of Common Stock reserved for future issuance:

	March 31, 2015		December 31, 2014
Stock-based compensation awards		2,465,079		1,807,349
Employee Stock Purchase Plan		304,991		140,500
Total		2,770,070		1,947,849