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Note 7 - Debt - Long-term Debt (Details) - USD ($)
$ in Thousands
Aug. 30, 2015
May. 31, 2015
Real Estate Loan [Member]    
Long-term Debt $ 14,924 $ 15,172
Capital Equipment Loan 1 [Member]    
Long-term Debt 7,263 7,705
Capital Equipment Loan 2 [Member]    
Long-term Debt 6,250 6,476
Capital Equipment Loan 3 [Member]    
Long-term Debt 3,776 3,907
Capital Equipment Loan 4 [Member]    
Long-term Debt 3,700 3,819
Term Loan [Member]    
Long-term Debt 2,250 3,000
Industrial Revenue Bonds [Member]    
Long-term Debt 2,440 2,440
Long-term Debt 40,603 42,519
Less current portion (7,650) (8,353)
Long-term portion $ 32,953 $ 34,166