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Note 7 - Debt - Long-term Debt (Details) - USD ($)
$ in Thousands
Nov. 29, 2015
May. 31, 2015
Real Estate Loan [Member]    
Long-term Debt $ 14,674 $ 15,172
Capital Equipment Loan 1 [Member]    
Long-term Debt 6,815 7,705
Capital Equipment Loan 2 [Member]    
Long-term Debt 6,022 6,476
Capital Equipment Loan 3 [Member]    
Long-term Debt 3,643 3,907
Capital Equipment Loan 4 [Member]    
Long-term Debt 3,521 $ 3,819
Progress payment loan [Member]    
Long-term Debt 5,771
Capital Equipment Loan 5 [Member]    
Long-term Debt 4,201
Term Note [Member]    
Long-term Debt 1,500 $ 3,000
Industrial Revenue Bonds [Member]    
Long-term Debt 2,065 2,440
Long-term Debt 48,212 42,519
Less current portion (13,527) (8,353) [1]
Long-term portion $ 34,685 $ 34,166 [1]
[1] Derived from audited financial statements.