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Note 2 - Investment in Non-public Company (Details Textual) - USD ($)		1 Months Ended			3 Months Ended		6 Months Ended
	Jul. 15, 2014	Oct. 29, 2014	Feb. 15, 2011	Jun. 30, 2010	Nov. 29, 2015	Nov. 30, 2014	Nov. 29, 2015	Nov. 30, 2014
Windset [Member] | Apio [Member] | Senior A Preferred Stock [Member]
Investment In Non Public Company Shares			150,000
Payments to Acquire Investments			$ 15,000,000
Preferred Stock, Liquidation Preference, Value					$ 15,000,000		$ 15,000,000
Windset [Member] | Apio [Member] | Common Stock [Member]
Investment In Non Public Company Shares	68		201
Payments to Acquire Investments			$ 201
Windset [Member] | Apio [Member] | Junior Preferred Shares [Member]
Investment In Non Public Company Shares	51,211
Preferred Stock, Liquidation Preference, Value					$ 5,100,000		$ 5,100,000
Windset [Member] | Apio [Member] | Senior B Preferred Stock [Member] | First Anniversary [Member]
Investments, Value of Shares with Put Option		$ 1,500,000
Windset [Member] | Apio [Member] | Senior B Preferred Stock [Member] | Second Anniversary [Member]
Investments, Value of Shares with Put Option		2,750,000
Windset [Member] | Apio [Member] | Senior B Preferred Stock [Member] | Third Anniversary [Member]
Investments, Value of Shares with Put Option		$ 2,750,000
Windset [Member] | Apio [Member] | Senior B Preferred Stock [Member]
Investment In Non Public Company Shares		70,000
Payments to Acquire Investments		$ 7,000,000
Preferred Stock, Dividend Rate, Percentage		7.50%
Windset [Member] | Apio [Member]
Payments to Acquire Investments	$ 11,000,000
Investment Ownership Percentage					60.00%		60.00%
Preferred Stock, Liquidation Preference, Value					$ 20,100,000		$ 20,100,000
Development Fee				$ 100,000
Annual Minimum License Fees				$ 150,000
License Costs					$ 120,000	$ 152,000	$ 226,000	$ 152,000
Windset [Member]
Investment Ownership Percentage	26.90%				26.90%		26.90%
Change In Market Value Of Investment In Company					$ 200,000	1,200,000	$ 1,000,000	1,400,000
Apio [Member]
Annual License Fee Percentage				3.00%
Senior A Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage							7.50%
Payments to Acquire Investments								18,000,000
Investment Income, Dividend					$ 413,000	$ 321,000	$ 825,000	$ 602,000

X

- Definition

Annual license fees as a percentage of net revenue.

+ References

No definition available.

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Change during the period in the market value of an investment in the company.

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Development fees associated with a license agreement.

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The amount of shares in an Investment in a non-public company.

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- Definition

Amount of dividend income on nonoperating securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(a))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Costs incurred and are directly related to generating license revenue. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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