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Note 6 - Stockholders' Equity (Tables)
 12 Months Ended
May 27, 2018
Notes Tables  
Share-based Compensation, Activity [Table Text Block]
           
 
Restricted Stock Outstanding
    
Stock Options
Outstanding
  
   
RSUs and
Options
Available
for Grant
    
Number
of
Restricted
Shares
    
Weighted
Average
Grant Date
Fair Value
    
Number of
Stock
Options
    
Weighted
Average
Exercise
Price
  
Balance at May 31, 2015
    
881,143
      
392,771
     $
14.15
      
1,736,718
     $
11.19
  
Granted
    
(443,175
)
    
177,675
     $
12.10
      
265,500
     $
12.04
  
Awarded/Exercised
    
—
      
(32,439
)
   $
13.28
      
(220,717
)
   $
6.44
  
Forfeited
    
28,000
      
(11,166
)
   $
14.36
      
(24,473
)
   $
14.38
  
Plan shares expired
    
—
      
—
      
—
      
(25,554
)
   $
9.86
  
Balance at May 29, 2016
    
465,968
      
526,841
     $
13.51
      
1,731,474
     $
11.90
  
Granted
    
(370,522
)
    
130,522
     $
13.37
      
240,000
     $
11.58
  
Awarded/Exercised
    
—
      
(130,508
)
   $
13.42
      
(357,639
)
   $
5.93
  
Forfeited
    
59,793
      
(17,500
)
   $
12.46
      
(42,293
)
   $
12.16
  
Plan shares expired
    
—
      
—
      
—
      
—
     $
—
  
Balance at May 28, 2017
    
155,239
      
509,355
     $
13.53
      
1,571,542
     $
13.20
  
Additional shares reserved
    
1,000,000
      
—
      
—
      
—
      
—
  
Granted
    
(698,288
 )    
200,288
     $
13.12
      
498,000
     $
12.93
  
Awarded/Exercised
    
—
      
(270,656
 )   $
14.06
      
(29,333
 )   $
7.36
  
Forfeited
    
85,324
      
(30,950
 )   $
11.75
      
(23,334
 )   $
12.55
  
Plan shares expired
    
—
      
—
      
 
      
(61,540
 )   $
14.23
  
Balance at May 27, 2018
    
542,275
      
408,037
     $
12.99
      
1,955,335
     $
13.20
  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
               
Options Outstanding
    
Options Exercisable
  
Range of
Exercise
Prices
    
Number of
Shares
Outstanding
    
Weighted Average Remaining Contractual Life (in years)
    
Weighted
Average
Exercise
Price
    
Aggregate
Intrinsic
Value
    
Number of
Shares
Exercisable
    
Weighted
Average
Exercise
Price
    
Aggregate
Intrinsic
Value
  
$ 6.66
- 
   $
14.39
      
1,955,335
      
4.33
     $
13.20
     $
1,937,832
      
1,383,732
     $
13.43
     $
1,122,822
  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block]
   
Outstanding
Options
    
Weighted
Average
Exercise Price
    
Weighted
Average
Remaining
Contract Term
(in years)
    
Aggregate
Intrinsic Value
  
Vested
    
1,383,732
     $
13.43
      
3.65
     $
1,122,822
  
Expected to vest
    
571,603
     $
12.63
      
5.96
      
815,010
  
Total
    
1,955,335
     $
13.20
      
4.33
     $
1,937,832