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Note 4 - Investments in Non-public Companies (Details) (USD $) | 3 Months Ended |  | 0 Months Ended | 1 Months Ended |  |  |  | 0 Months Ended | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 25, 2013 | Aug. 26, 2012 | Feb. 15, 2011 Preferred Stock [Member] Windset [Member] | Feb. 15, 2011 Common Stock [Member] Apio [Member] Windset [Member] | Feb. 15, 2011 Common Stock [Member] Windset [Member] | May 30, 2010 Aesthetic Sciences [Member] | Aug. 25, 2013 Aesthetic Sciences [Member] | May 26, 2013 Aesthetic Sciences [Member] | Jul. 16, 2010 Aesthetic Sciences [Member] | Feb. 15, 2011 Windset [Member] | May 31, 2013 Windset [Member] | May 31, 2012 Windset [Member] | Feb. 24, 2013 Windset [Member] | Feb. 26, 2012 Windset [Member]
Note 4 - Investments in Non-public Companies (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Investments |  |  |  |  |  |  | $ 793,000 | $ 793,000 | $ 1,800,000 |  |  |  |  |
Other than Temporary Impairment Losses, Investments |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |
Investment in Non-Public Company Shares (in Shares) |  |  | 150,000 | 201 |  |  |  |  |  |  |  |  |  |
Payments to Acquire Investments |  |  |  | 201 | 15,000,000 |  |  |  |  |  |  |  |  |
Investment Ownership Percentage |  |  |  |  |  |  |  |  |  | 20.10% |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  |  | 7.50% |  |  |  |
Dividends and Interest Paid |  |  |  |  |  |  |  |  |  |  | 1,100,000 | 1,100,000 |  |
Investment Income, Dividend | 281,000 | 281,000 |  |  |  |  |  |  |  |  |  |  |  |
Change in Market Value Of Investment in Company |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,400,000 | $ 4,300,000

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- Definition The contractual amount of dividends (or interest on participating income bonds) that must be paid for the current period (for example, unpaid cumulative dividends). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780132-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2740-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2814-109256 + Details
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