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Note 7 - Debt (Tables)
 6 Months Ended
Nov. 25, 2018
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
November 25, 2018
    
May 27, 2018
  
Term loan with JPMorgan Chase Bank (“JPMorgan”), BMO Harris Bank N.A. (“BMO”), and City National Bank; due in quarterly principal and interest payments of $1,250 beginning December 1, 2016 through September 23, 2021 with the remainder due on maturity, with interest based on the Company’s leverage ratio at a per annum rate of the Eurodollar rate plus a spread of between 1.25% and 2.25%
   $
40,000
     $
42,500
  
Total principal amount of long-term debt
    
40,000
      
42,500
  
Less: unamortized debt issuance costs
    
(171
)
    
(200
)
Total long-term debt, net of unamortized debt issuance costs
    
39,829
      
42,300
  
Less: current portion of long-term debt, net
    
(4,940
)
    
(4,940
)
Long-term debt, net
   $
34,889
     $
37,360