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Note 3 - Investment in Non-public Company (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Jul. 15, 2014
Jul. 15, 2014
Feb. 15, 2011
Oct. 29, 2014
Aug. 26, 2018
Aug. 27, 2017
Investment Income, Dividend         $ 413,000 $ 413,000
Senior A Preferred Stock [Member]            
Preferred Stock, Dividend Rate, Percentage   7.50%        
Windset [Member]            
Investment Ownership Percentage 26.90% 26.90%     26.90%  
Investment Income, Dividend         $ 412,500 412,500
Windset [Member] | Other Income [Member]            
Change In Market Value Of Investment In Company         1,000,000 $ 900,000
Windset [Member] | Apio [Member]            
Payments to Acquire Investments, Total $ 11,000,000          
Dividends on Investment, Timeframe to Be Paid After Anniversary   90 days        
Investment, Preferred Stock, Liquidation Preference, Value         20,100,000  
Windset [Member] | Apio [Member] | Junior Preferred Shares [Member]            
Investment, Preferred Stock, Dividends Declared         0  
Investment, Preferred Stock, Liquidation Preference, Value         5,100,000  
Windset [Member] | Apio [Member] | Senior A Preferred Stock [Member]            
Investment, Preferred Stock, Liquidation Preference, Value         $ 15,000,000  
Windset [Member] | Apio [Member] | Senior A Preferred Stock [Member]            
Investment In Non Public Company Shares     150,000      
Payments to Acquire Investments, Total     $ 15,000,000      
Windset [Member] | Apio [Member] | Common Stock [Member]            
Investment In Non Public Company Shares 68 68 201      
Payments to Acquire Investments, Total     $ 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, Total       $ 7,000,000    
Preferred Stock, Dividend Rate, Percentage       7.50%