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Note 12 - Quarterly Consolidated Financial Information (Unaudited) (Tables)
 12 Months Ended
May 27, 2018
Notes Tables  
Quarterly Financial Information [Table Text Block]
Fiscal Year 2018
  
1st Quarter
    
2nd Quarter
    
3rd Quarter
    
4th Quarter
    
Annual
  
Revenues
   $
115,781
     $
122,461
     $
144,909
     $
141,076
     $
524,227
  
Gross profit
   $
18,802
     $
14,921
     $
19,806
     $
24,809
     $
78,338
  
Net income from continuing operations
   $
2,355
     $
414
     $
16,281
     $
6,711
     $
25,761
  
Net income applicable to common stockholders
   $
2,146
     $
487
     $
16,088
     $
6,108
     $
24,829
  
Net income per basic share from continuing operations
   $
0.08
     $
0.02
     $
0.59
     $
0.24
     $
0.93
  
Net income per diluted share from continuing operations
   $
0.08
     $
0.02
     $
0.58
     $
0.24
     $
0.92
  
Fiscal Year 2017
  
1st Quarter
    
2nd Quarter
    
3rd Quarter
    
4th Quarter
    
Annual
  
Revenues
   $
109,055
     $
110,164
     $
129,292
     $
121,265
     $
469,776
  
Gross profit
   $
20,116
     $
17,103
     $
22,873
     $
19,120
     $
79,212
  
Net income from continuing operations
   $
3,183
     $
765
     $
3,591
     $
2,596
     $
10,135
  
Net income applicable to common stockholders
   $
3,312
     $
1,326
     $
3,500
     $
2,452
     $
10,590
  
Net income per basic share from continuing operations
   $
0.12
     $
0.03
     $
0.13
     $
0.09
     $
0.37
  
Net income per diluted share from continuing operations
   $
0.11
     $
0.03
     $
0.13
     $
0.09
     $
0.36
  
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
Fiscal Year 2018
  
1st Quarter
    
2nd Quarter
    
3rd Quarter
  
Cash provided by (used in) operating activities:
                        
As Reported
   $
(131
 )   $
4,330
     $
18,098
  
Adjustment
    
3,581
      
2,006
      
2,202
  
Restated
   $
3,450
     $
6,336
     $
20,300
  
Cash used in investing activities:
                        
As Reported
   $
(3,288
 )   $
(9,457
 )   $
(20,544
 )
Adjustment
    
(3,581
 )    
(2,006
 )    
(2,202
 )
Restated
   $
(6,869
 )   $
(11,463
 )   $
(22,746
 )
Fiscal Year 2017
  
1st Quarter
    
2nd Quarter
    
3rd Quarter
  
Cash provided by operating activities:
                        
As Reported
   $
6,467
     $
5,527
     $
23,181
  
Adjustment
    
3,502
      
4,185
      
3,445
  
Restated
   $
9,969
     $
9,712
     $
26,626
  
Cash used in investing activities:
                        
As Reported
   $
(2,122
 )   $
(4,724
 )   $
(9,414
 )
Adjustment
    
(3,502
 )    
(4,185
 )    
(3,445
 )
Restated
   $
(5,624
 )   $
(8,909
 )   $
(12,859
 )