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Note 7 - Debt - Long-term Debt (Details) (Parentheticals) - USD ($)
$ in Thousands
12 Months Ended
May 28, 2017
May 29, 2016
Term Loan [Member]    
Debt Instrument, Periodic Payment $ 1,250 $ 1,250
Term Loan [Member] | Minimum [Member]    
Interest rate 1.25% 1.25%
Term Loan [Member] | Maximum [Member]    
Interest rate 2.25% 2.25%
Real Estate Loan [Member]    
Debt Instrument, Periodic Payment $ 133 $ 133
Interest rate 4.02% 4.02%
Capital Equipment Loan 1 [Member]    
Debt Instrument, Periodic Payment $ 175 $ 175
Interest rate 4.39% 4.39%
Capital Equipment Loan 2 [Member]    
Debt Instrument, Periodic Payment $ 95 $ 95
Interest rate 3.68% 3.68%
Capital Equipment Loan 3 [Member]    
Debt Instrument, Periodic Payment $ 56 $ 56
Interest rate 3.74% 3.74%
Capital Equipment Loan 4 [Member]    
Debt Instrument, Periodic Payment $ 68 $ 68
Interest rate 2.79% 2.79%
Real Estate Loan 2 [Member]    
Debt Instrument, Periodic Payment $ 32 $ 32
Real Estate Loan 2 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument, Basis Spread on Variable Rate 2.25% 2.25%
Capital Equipment Loan 5 [Member]    
Debt Instrument, Periodic Payment $ 108 $ 108
Capital Equipment Loan 5 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument, Basis Spread on Variable Rate 2.25% 2.25%
Capital Equipment Loan 6 [Member]    
Debt Instrument, Periodic Payment $ 75 $ 75
Capital Equipment Loan 6 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Interest rate 2.92% 2.92%