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Note 6 - Stockholders' Equity (Tables)
 12 Months Ended
May 28, 2017
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 25, 2014
    
2,000,000
      
149,300
     $
13.17
      
1,215,860
     $
8.45
  
Granted
    
(1,118,857
)
    
324,357
     $
13.97
      
794,500
     $
14.20
  
Awarded/Exercised
    
—
      
(79,219
)
   $
11.57
      
(205,419
)
   $
6.55
  
Forfeited
    
—
      
(1,667
)
   $
14.30
      
(2,223
)
   $
14.30
  
Plan shares expired
    
—
      
—
      
—
      
(66,000
)
   $
11.32
  
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
  
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
 
  $5.77
-
$14.39
      
1,571,542
      
4.68
     $
13.20
     $
1,362,499
      
1,021,097
     $
13.40
     $
752,758
  
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
    
1,021,097
     $
13.40
      
4.18
      
752,758
  
Expected to vest
    
550,445
     $
12.83
      
5.61
      
609,741
  
Total
    
1,571,542
     $
13.20
      
4.68
      
1,362,499