Note 7 - Common Stock (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

Schedule of Stockholders Equity [Table Text Block]

	June 30,		December 31,
	2018		2017
Options or RSUs available for future grant under stock option plans		779		999
RSUs outstanding under stock option plans		938		568
Options outstanding under stock option plans		548		436
Shares available for future issuance under employee stock purchase plan		208		182
Total		2,473		2,185