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Note 4 - Stock-based Compensation
6 Months Ended
Nov. 26, 2017
Notes to Financial Statements  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
4
.
Stock-Based Compensation
 
The Company
’s stock-based awards include stock option grants and 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
   
Six
Months Ended
 
   
November
26, 2017
   
November 27
, 2016
   
November
26, 2017
   
November 27
, 2016
 
Options
  $
354
    $
307
    $
678
    $
599
 
RSUs
   
762
     
659
     
1,388
     
1,174
 
Total stock-based compensation
  $
1,116
    $
966
    $
2,066
    $
1,773
 
 
The following table summarizes the stock-based compensation by income statement line item (in thousands):
 
   
Three Months Ended
   
Six
Months Ended
 
   
November
26, 2017
   
November 27
, 2016
   
November
26, 2017
   
November 27
, 2016
 
Cost of sales
  $
137
    $
124
    $
261
    $
237
 
Re
search and development
   
23
     
23
     
42
     
46
 
Selling, general and administrative
   
956
     
819
     
1,763
     
1,490
 
Total stock-based compensation
  $
1,116
    $
966
    $
2,066
    $
1,773
 
 
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 method to recognize the fair value of stock-based compensation arrangements.
 
As of
November 26, 2017,
there was
$6.2
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
2.5
years for stock options and
2.0
years for restricted stock unit awards.