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Note 2 - Investments in Non-public Companies (Details) (USD $) | 3 Months Ended |  | 0 Months Ended |  |  | 0 Months Ended |  |  | 0 Months Ended |  |  |  | 0 Months Ended | 1 Months Ended |  | 1 Months Ended |  |  |  | 0 Months Ended | 3 Months Ended |
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Aug. 31, 2014 | Aug. 25, 2013 | Jul. 15, 2014 Preferred Stock [Member] Apio, Inc [Member] Windset [Member] | Feb. 15, 2011 Preferred Stock [Member] Windset [Member] | Jul. 15, 2014 Preferred Stock [Member] Windset [Member] | Feb. 15, 2011 Preferred Stock [Member] Windset [Member] | Feb. 15, 2011 Common Stock [Member] Apio, Inc [Member] Windset [Member] | Jul. 15, 2014 Common Stock [Member] Apio, Inc [Member] Windset [Member] | Feb. 15, 2011 Common Stock [Member] Apio, Inc [Member] Windset [Member] | Feb. 15, 2011 Common Stock [Member] Windset [Member] | Jul. 15, 2014 Common Stock [Member] Windset [Member] | Feb. 15, 2011 Common Stock [Member] Windset [Member] | Aug. 31, 2014 Senior Preferred Shares [Member] Apio, Inc [Member] Windset [Member] | Aug. 31, 2014 Junior Preferred Shares [Member] Apio, Inc [Member] Windset [Member] | Jul. 15, 2014 Apio, Inc [Member] Windset [Member] | Jun. 30, 2010 Apio, Inc [Member] Windset [Member] | Aug. 31, 2014 Apio, Inc [Member] Windset [Member] | May 30, 2010 Aesthetic Sciences [Member] | Aug. 31, 2014 Aesthetic Sciences [Member] | May 25, 2014 Aesthetic Sciences [Member] | Jul. 16, 2010 Aesthetic Sciences [Member] | Feb. 15, 2011 Windset [Member] | Aug. 31, 2014 Windset [Member] | Aug. 25, 2013 Windset [Member] | Jul. 15, 2014 Windset [Member]
Note 2 - 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) |  |  | 15,857 |  | 15,857 | 150,000 |  | 68 | 201 |  | 68 | 201 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Investments | 11,000,000 |  |  | 15,000,000 |  |  | 201 |  |  | 201 |  |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |
Investment Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26.90% |  | 26.90%
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50% |  |  |
Preferred Stock, Liquidation Preference, Value |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 | 5,100,000 |  |  | 20,100,000 |  |  |  |  |  |  |  |
Investment Income, Dividend | 281,000 | 281,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 281,000 | 281,000 |
Change in Market Value of Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 5,400,000 |
Development Fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |
Annual License Fee Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |
Annual Minimum License Fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000 |  |  |  |  |  |  |  |  |

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