Note 10 - Share-based Employee Compensation (Tables)
 3 Months Ended
Aug. 30, 2016
Notes Tables  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
 
 
 
Stock Options
 
 
Weighted
Average
Exercise
Price
 
 
 
Weighted Average
Remaining Contractual
Term (years)
 
 
 
 
Aggregate
Intrinsic Value
 
Service-based vesting:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding at
May 31, 2016
 
 
2,066
 
 
$
7.
89
 
 
 
 
 
 
 
 
 
Granted
    
809
      
3.82
                  
Cancellations and forfeitures
 
 
(
3
)
 
 
6.40
 
 
 
 
 
 
 
 
 
Expired
 
 
(
87
)
 
 
6.64
 
 
 
 
 
 
 
 
 
Outstanding at
August 30, 2016
 
 
2,785
 
 
$
6.75
 
 
 
4.07
 
 
$
–
 
Exercisable at
August 30, 2016
 
 
1,806
 
 
$
8.14
 
 
 
2.72
 
 
$
–
 
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
 
 
 
 
Shares
 
 
Weighted
Average
Fair Value
 
Service-Based Vesting:
 
 
 
 
 
 
 
 
Unvested at
May 31, 2016
 
 
564
 
 
$
6.
29
 
Granted
 
 
292
 
 
 
3.82
 
Vested
 
 
(
102
)
 
 
6.67
 
Cancellations and forfeitures
 
 
(
16
)
 
 
6.47
 
Unvested at
August 30, 2016
 
 
738
 
 
$
5.25
 
 
 
 
 
 
 
 
 
 
Performance-Based Vesting:
 
 
 
 
 
 
 
 
Unvested at May 31, 2016
 
 
225
 
 
$
6.51
 
Cancellations and forfeitures
 
 
(
5
)
 
 
6.51
 
Unvested at
August 30, 2016
 
 
220
 
 
$
6.51