Note 6 - Common Stock (Tables)

3 Months Ended

Mar. 31, 2015

Stockholders' Equity Note [Abstract]

Common Stock Reserve for Future Issuance [Table Text Block]

	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