Note 7 - Common Stock (Tables)

6 Months Ended

Jun. 30, 2015

Notes Tables

Common Stock Reserve for Future Issuance [Table Text Block]

	June 30, 2015		December 31, 2014
Stock-based compensation awards		2,461,157		1,807,349
Employee Stock Purchase Plan		299,127		140,500
Total		2,760,284		1,947,849