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Note 8 - Debt - Long-term Debt (Details) - USD ($)
$ in Thousands
Feb. 28, 2016
May. 31, 2015
Real Estate Loan [Member]    
Long-term Debt $ 14,422 $ 15,172
Capital Equipment Loan 1 [Member]    
Long-term Debt 6,363 7,705
Capital Equipment Loan 2 [Member]    
Long-term Debt 5,792 6,476
Capital Equipment Loan 3 [Member]    
Long-term Debt 3,510 3,907
Capital Equipment Loan 4 [Member]    
Long-term Debt 3,340 $ 3,819
Real Estate Loan 2 [Member]    
Long-term Debt 7,686
Capital Equipment Loan 5 [Member]    
Long-term Debt 9,089
Capital Equipment Loan 6 [Member]    
Long-term Debt 4,136
Term Note [Member]    
Long-term Debt 750 $ 3,000
Industrial Revenue Bonds [Member]    
Long-term Debt 2,065 2,440
Long-term Debt 57,153 42,519
Less current portion (8,546) (8,353) [1]
Long-term portion $ 48,607 $ 34,166 [1]
[1] Derived from audited financial statements.