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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies (Tables)
6 Months Ended
Nov. 25, 2018
Notes Tables  
Schedule of Cash and Cash Equivalents [Table Text Block]
   
November 25, 2018
   
May 27, 2018
   
November 26, 2017
   
May 28, 2017
 
Cash and cash equivalents
  $
1,514
    $
2,899
    $
4,602
    $
5,998
 
Restricted cash
   
325
     
325
     
325
     
325
 
Cash, discontinued operations
   
     
(8
)    
(233
)    
(589
)
Cash, cash equivalents and restricted cash
  $
1,839
    $
3,216
    $
4,694
    $
5,734
 
Schedule of Inventory, Current [Table Text Block]
   
November 25, 2018
   
May 27, 2018
 
Raw materials
  $
14,607
    $
15,286
 
Work in progress
   
3,092
     
3,672
 
Finished goods
   
13,929
     
12,861
 
Total
  $
31,628
    $
31,819
 
Comprehensive Income (Loss) [Table Text Block]
   
AOCI
 
Accumulated OCI, net, as of May 27, 2018
  $
1,148
 
Unrealized losses on interest rate swap contracts, net of tax effect
   
(13
)
Amounts reclassified from OCI
   
 
Accumulated OCI, net, as of November 25, 2018
  $
1,135
 
Schedule of Effect of Significant Unobservable Inputs for Contingent Liability [Table Text Block] <div style="display: inline; font-family: times new roman; font-size: 10pt"><table border="0" cellpadding="0" cellspacing="0" style="; font-size: 10pt; font-family: "Times New Roman", Times, serif; text-indent: 0px; min-; min-width: 700px;"> <tr style="vertical-align: bottom;"> <td style="font-family: "Times New Roman", Times, serif; font-size: 10pt; width: 66%;"> </td> <td style="font-family: "Times New Roman", Times, serif; font-size: 10pt; width: 1%;"> </td> <td colspan="3" rowspan="1" style="text-align: center; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 55%;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">At November 25, 2018</div> </td> <td style="font-family: "Times New Roman", Times, serif; font-size: 10pt; padding-bottom: 1px; width: 1%;"> </td> <td style="font-family: "Times New Roman", Times, serif; font-size: 10pt; width: 1%;"> </td> <td colspan="3" rowspan="1" style="text-align: center; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 5%;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">At May 27, 2018</div> </td> <td style="font-family: "Times New Roman", Times, serif; font-size: 10pt; padding-bottom: 1px; width: 1%;"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"> <td style="font-family: "Times New Roman", Times, serif; font-size: 10pt; width: 66%;"> <div style=" font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt;">Cost of debt</div> </td> <td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: right;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">5.3%</div></td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">to</div></td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">5.7%</div></td> <td nowrap="nowrap" style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"> </td> <td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; text-align: center;"> </td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: right;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">4.7%</div></td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">to</div></td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">5.2%</div></td> <td nowrap="nowrap" style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"> <td style="font-family: "Times New Roman", Times, serif; font-size: 10pt; width: 66%;"> <div style=" font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt;">Market price of risk adjustment</div> </td> <td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div></td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">20%</div></td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div></td> <td nowrap="nowrap" style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"> </td> <td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; text-align: center;"> </td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div></td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">20%</div></td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div></td> <td nowrap="nowrap" style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"> <td style="font-family: "Times New Roman", Times, serif; font-size: 10pt; width: 66%;"> <div style=" font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt;">EBITDA volatility</div> </td> <td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div></td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">24%</div></td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div></td> <td nowrap="nowrap" style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"> </td> <td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; text-align: center;"> </td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div></td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">25%</div></td> <td style="width: 5%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div></td> <td nowrap="nowrap" style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;"> </td> </tr> </table></div>
Sensitivity Analysis [Table Text Block]
   
Impact on value of
Contingent consideration liability
as of November 25, 2018
 
10% increase in EBITDA forecast
  $
300
 
Schedule of Effect of Significant Unobservable Inputs for Investment [Table Text Block]
   
At November 25, 2018
   
At May 27, 2018
 
Revenue growth rates
 
6%
   
6%
 
Expense growth rates
 
6%
   
6%
 
Income tax rates
 
15%
   
15%
 
Discount rates
 
12%
   
12%
 
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block]
   
Impact on value of
investment in Windset
as of November 25, 2018
 
10% increase in revenue growth rates
  $
9,800
 
10% increase in expense growth rates
  $
(9,300
)
10% increase in income tax rates
  $
(500
)
10% increase in discount rates
  $
(3,700
)
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Fair Value at November 25, 2018
   
Fair Value at May 27, 2018
 
Assets:
 
Level 1
   
Level 2
   
Level 3
   
Level 1
   
Level 2
   
Level 3
 
Interest rate swap contracts
  $
    $
1,512
    $
    $
    $
1,529
    $
 
Investment in non-public company
   
     
     
68,100
     
     
     
66,500
 
Total assets
  $
    $
1,512
    $
68,100
    $
    $
1,529
    $
66,500
 
                                                 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Contingent consideration liability
   
     
     
3,100
     
     
     
4,000
 
Total liabilities
  $
    $
    $
3,100
    $
    $
    $
4,000
 
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   
Windset Investment
   
Contingent
Consideration Liability
 
Balance as of May 27, 2018
  $
66,500
    $
4,000
 
Fair value change
   
1,600
     
(900
)
Balance as of November 25, 2018
  $
68,100
    $
3,100
 
Disaggregation of Revenue [Table Text Block]
   
Three Months Ended
   
Six Months Ended
 
Natural Foods:
 
November 25, 2018
   
November 26, 2017
   
November 25, 2018
   
November 26, 2017
 
Salads
  $
41,950
    $
44,578
    $
91,030
    $
86,626
 
Core vegetables
   
64,492
     
61,906
     
126,242
     
121,549
 
Other
   
3,024
     
1,864
     
4,245
     
3,790
 
Total
  $
109,466
    $
108,348
    $
221,517
    $
211,965
 
   
Three Months Ended
   
Six Months Ended
 
Biomaterials:
 
November 25, 2018
   
November 26, 2017
   
November 25, 2018
   
November 26, 2017
 
Aseptic
  $
8,128
    $
7,591
    $
13,894
    $
14,618
 
Fermentation
   
1,915
     
2,865
     
4,985
     
5,655
 
Development services
   
5,403
     
3,657
     
9,184
     
6,004
 
Total
  $
15,446
    $
14,113
    $
28,063
    $
26,277