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Note 3 - Stock-based Compensation
 3 Months Ended
Aug. 28, 2016
Notes to Financial Statements  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
3.
Stock-Based Compensation
 
The Company’s stock-based awards include stock option grants and restricted stock unit awards (“RSUs”). The Company records compensation expense for stock-based awards issued to employees and directors in exchange for services provided based on the estimated fair value of the awards on their grant dates and is recognized over the required service periods, generally the vesting period.
 
The following table summarizes the stock-based compensation for options and RSUs (in thousands):
 
   
Three Months Ended
  
   
August 28, 2016
    
August 30, 2015
  
Options
   $ 291     $ 330  
RSUs
     516       467  
Total stock-based compensation expense
   $ 807     $ 797  
 
The following table summarizes the stock-based compensation by income statement line item (in thousands):
 
   
Three Months Ended
  
   
August 28, 2016
    
August 30, 2015
  
Cost of sales
   $ 113     $ 98  
Research and development
     23       22  
Selling, general and administrative
     671       677  
Total stock-based compensation expense
   $ 807     $ 797  
 
The estimated fair value for stock options, which determines the Company’s calculation of stock-based compensation expense, is based on the Black-Scholes option pricing model. RSUs are valued at the closing market price of the Company’s common stock on the date of grant. The Company uses the straight-line single option method to calculate and recognize the fair value of stock-based compensation arrangements.
 
As of August 28, 2016, there was $6.1 million of total unrecognized compensation expense related to unvested equity compensation awards granted under the Landec incentive stock plans. Total expense is expected to be recognized over the weighted-average period of 2 years for both stock options and restricted stock unit awards.