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RELATED PARTY TRANSACTION (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Oct. 16, 2014	Aug. 09, 2013	May 15, 2013	May 28, 2016	May 30, 2015	May 31, 2014
Rental expense				$ 2,000	$ 1,800	$ 1,500
Richardson Wildlife Foundation [Member] | Common Class B [Member]
Number of shares repurchased	50,000		48,925
Negotiated share price	$ 9.91		$ 11.70
Mr. Edward Richardson [Member] | Common Class B [Member]
Number of shares repurchased		300,000	200,000
Negotiated share price		$ 11.50	$ 11.70
IMES [Member] | Executive Vice President [Member]
Total future minimum lease payments				$ 600
Lease term				5 years
Renewal term				5 years
Rental expense				$ 100

X

- Definition

Term of the lessor's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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Price of a single share of a number of saleable stocks of a company.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ 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(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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