Note 7 - Debt - Long-term Debt (Details) (Parentheticals) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Nov. 29, 2015	May. 31, 2015
Real Estate Loan [Member]
Periodic payment	$ 133,060	$ 133,060
Debt Instrument, Interest Rate, Stated Percentage	4.02%	4.02%
Capital Equipment Loan 1 [Member]
Periodic payment	$ 175,356	$ 175,356
Debt Instrument, Interest Rate, Stated Percentage	4.39%	4.39%
Capital Equipment Loan 2 [Member]
Periodic payment	$ 95,120	$ 95,120
Debt Instrument, Interest Rate, Stated Percentage	3.68%	3.68%
Capital Equipment Loan 3 [Member]
Periodic payment	$ 55,828	$ 55,828
Debt Instrument, Interest Rate, Stated Percentage	3.74%	3.74%
Capital Equipment Loan 4 [Member]
Periodic payment	$ 68,274	$ 68,274
Debt Instrument, Interest Rate, Stated Percentage	2.79%	2.79%
Progress payment loan [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	1.75%	1.75%
Capital Equipment Loan 5 [Member]
Periodic payment	$ 75,345
Debt Instrument, Interest Rate, Stated Percentage	2.92%
Term Note [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	2.00%	2.00%
Term Note [Member]
Periodic payment	$ 250,000	$ 250,000
Industrial Revenue Bonds [Member]
Debt Instrument, Interest Rate, Stated Percentage	0.21%	0.31%

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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