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Note 4 - Investments in Non-public Companies (Details) (USD $) | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |  |  | 0 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2013 | May 26, 2013 | May 27, 2012 | May 29, 2011 | Feb. 15, 2011 Preferred Stock [Member] Windset [Member] | Feb. 15, 2011 Common Stock [Member] Windset [Member] | May 30, 2010 Aesthetic Sciences [Member] | May 26, 2013 Aesthetic Sciences [Member] | Jul. 16, 2010 Aesthetic Sciences [Member] | Feb. 15, 2011 Windset [Member] | May 29, 2011 Windset [Member] | May 26, 2013 Windset [Member] | May 27, 2012 Windset [Member]
Note 4 - Investments in Non-public Companies (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Investments |  |  |  |  |  |  |  | $ 793,000 | $ 1,800,000 |  |  |  |
Other than Temporary Impairment Losses, Investments |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Investments in and Advances to Affiliates, Balance, Shares (in Shares) |  |  |  |  | 150,000 | 201 |  |  |  |  |  |  |
Cost Method Investments |  | 793,000 | 793,000 |  | 15,000,000 | 201 |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 20.10% | 20.10% |  |  |  |  |  |  | 20.10% |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  |  | 7.50% |  |  |
Dividends and Interest Paid | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Investment Income, Dividend |  | 1,125,000 | 1,125,000 | 328,000 |  |  |  |  |  |  | 328,000 |  |
Change in Market Value Of Investment in Company |  |  |  |  |  |  |  |  |  |  | $ 662,000 | $ 8,100,000 | $ 5,800,000

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