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Note 9 - Business Segment Reporting (Tables)
6 Months Ended
Nov. 25, 2018
Notes Tables  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
Three Months Ended
   
Six Months Ended
 
   
November 25, 2018
   
November 26, 2017
   
November 25, 2018
   
November 26, 2017
 
Canada
  $
20.3
    $
17.3
    $
40.2
    $
35.6
 
Belgium
  $
0.5
    $
0.5
    $
2.5
    $
2.7
 
Ireland
  $
1.2
    $
0.8
    $
2.3
    $
1.6
 
Denmark
  $
    $
0.5
    $
0.2
    $
0.7
 
Switzerland
  $
0.5
    $
    $
0.6
    $
 
Mexico
  $
0.1
    $
0.2
    $
0.1
    $
0.3
 
All Other Countries
  $
0.6
    $
1.1
    $
1.1
    $
1.2
 
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Natural Foods
   
Biomaterials
   
Other
   
Total
 
Three Months Ended November 25, 2018
                               
Net sales
  $
109,466
    $
15,446
    $
    $
124,912
 
International sales
  $
20,367
    $
2,842
    $
    $
23,209
 
Gross profit
  $
10,915
    $
5,678
    $
    $
16,593
 
Net (loss) income from continuing operations
  $
(418
)   $
1,298
    $
(1,464
)   $
(584
)
Depreciation and amortization
  $
2,196
    $
978
    $
139
    $
3,313
 
Dividend income
  $
412
    $
    $
    $
412
 
Interest income
  $
30
    $
    $
3
    $
33
 
Interest expense, net
(1)
  $
276
    $
    $
470
    $
746
 
Income tax (benefit) expense
  $
(50
)   $
432
    $
(105
)   $
277
 
                                 
Six Months Ended November 25, 2018
                               
Net sales
  $
221,517
    $
28,063
    $
    $
249,580
 
International sales
  $
40,480
    $
6,558
    $
    $
47,038
 
Gross profit
  $
24,285
    $
8,645
    $
    $
32,930
 
Net income (loss) from continuing operations
  $
1,349
    $
751
    $
(2,495
)   $
(395
)
Depreciation and amortization
  $
4,236
    $
1,954
    $
268
    $
6,458
 
Dividend income
  $
825
    $
    $
    $
825
 
Interest income
  $
61
    $
    $
18
    $
79
 
Interest expense, net
(1)
  $
863
    $
    $
641
    $
1,504
 
Income tax expense (benefit)
  $
612
    $
250
    $
(520
)   $
342
 
                                 
Three Months Ended November 26, 2017
                               
Net sales
  $
108,348
    $
14,113
    $
    $
122,461
 
International sales
  $
17,749
    $
2,675
    $
    $
20,424
 
Gross profit
  $
9,704
    $
5,217
    $
    $
14,921
 
Net (loss) income from continuing operations
  $
(435
)
  $
1,260
    $
(411
)
  $
414
 
Depreciation and amortization
  $
1,958
    $
910
    $
112
    $
2,980
 
Dividend income
  $
412
    $
    $
    $
412
 
Interest income
  $
18
    $
    $
24
    $
42
 
Interest expense, net
  $
    $
    $
480
    $
480
 
Income tax (benefit) expense
  $
(95
)
  $
374
    $
(114
)
  $
165
 
                                 
Six Months Ended November 26, 2017
                               
Net sales
  $
211,965
    $
26,277
    $
    $
238,242
 
International sales
  $
35,923
    $
6,174
    $
    $
42,097
 
Gross profit
  $
24,984
    $
8,739
    $
    $
33,723
 
Net income (loss) from continuing operations
  $
3,166
    $
1,105
    $
(1,502
)
  $
2,769
 
Depreciation and amortization
  $
3,930
    $
1,775
    $
229
    $
5,934
 
Dividend income
  $
825
    $
    $
    $
825
 
Interest income
  $
28
    $
    $
45
    $
73
 
Interest expense, net
  $
    $
    $
884
    $
884
 
Income tax expense
  $
1,002
    $
347
    $
126
    $
1,475