Note 4 - Stock-based Compensation (Tables)

9 Months Ended

Feb. 28, 2016

Notes Tables

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Three Months Ended February 28, 2016		Three Months Ended March 1 , 201 5		Nine Months Ended February 28 , 201 6		Nine Months Ended March 1 , 201 5
Options	$	331	$	139	$	1,021	$	394
RSUs		553		252		1,560		745
Total stock-based compensation	$	884	$	391	$	2,581	$	1,139

	Three Months Ended February 28 , 201 6		Three Months Ended March 1 , 201 5		Nine Months Ended February 28 , 201 6		Nine Months Ended March 1 , 201 5
Research and development	$	59	$	8	$	179	$	28
Sales, general and administrative		825		383		2,402		1,111
Total stock-based compensation	$	884	$	391	$	2,581	$	1,139