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Note 3 - Investment in Non-public Company (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 15, 2014 | Jul. 15, 2014 | Feb. 15, 2011 | Oct. 29, 2014 | Feb. 25, 2018 | Feb. 26, 2017 | Feb. 25, 2018 | Feb. 26, 2017
Investment Income, Dividend |  |  |  |  | $ 413,000 | $ 413,000 | $ 1,238,000 | $ 1,238,000
Senior A Preferred Stock [Member] |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 7.50% |  |  |  |  |  |  |
Windset [Member] |  |  |  |  |  |  |  |
Investment Ownership Percentage | 26.90% | 26.90% |  |  | 26.90% |  | 26.90% |
Investment Income, Dividend |  |  |  |  | $ 412,500 | $ 412,500 | $ 1,200,000 | 1,200,000
Windset [Member] | Other Income [Member] |  |  |  |  |  |  |  |
Change In Market Value Of Investment In Company |  |  |  |  |  |  | 2,200,000 | $ 700,000
Windset [Member] | Apio [Member] |  |  |  |  |  |  |  |
Payments to Acquire Investments |  | $ 11,000,000 |  |  |  |  |  |
Dividends on Investment, Timeframe to Be Paid After Anniversary | 90 days |  |  |  |  |  |  |
Investment, Preferred Stock, Liquidation Preference, Value |  |  |  |  | 20,100,000 |  | 20,100,000 |
Windset [Member] | Apio [Member] | Junior Preferred Shares [Member] |  |  |  |  |  |  |  |
Investment, Preferred Stock, Dividends Declared |  |  |  |  | 0 |  | 0 |
Investment, Preferred Stock, Liquidation Preference, Value |  |  |  |  | 5,100,000 |  | 5,100,000 |
Windset [Member] | Apio [Member] | Senior A Preferred Stock [Member] |  |  |  |  |  |  |  |
Investment, Preferred Stock, Liquidation Preference, Value |  |  |  |  | $ 15,000,000 |  | $ 15,000,000 |
Windset [Member] | Apio [Member] | Senior A Preferred Stock [Member] |  |  |  |  |  |  |  |
Investment In Non Public Company Shares |  |  | 150,000 |  |  |  |  |
Payments to Acquire Investments |  |  | $ 15,000,000 |  |  |  |  |
Windset [Member] | Apio [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Investment In Non Public Company Shares | 68 | 68 | 201 |  |  |  |  |
Payments to Acquire Investments |  |  | $ 201 |  |  |  |  |
Windset [Member] | Apio [Member] | Junior Preferred Shares [Member] |  |  |  |  |  |  |  |
Investment In Non Public Company Shares | 51,211 | 51,211 |  |  |  |  |  |
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] | 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 |  |  |  |

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