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Note 5 - Marketable Securities (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 12 Months Ended
Jan. 06, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Mar. 31, 2017
Jun. 29, 2016
Marketable Securities   $ 3,704,000 $ 4,594,000   $ 4,594,000  
Available-for-sale Securities, Amortized Cost Basis   3,590,000 4,331,000   4,331,000  
Available-for-sale Securities, Gross Unrealized Gain   158,000     279,000  
Available-for-sale Securities, Gross Unrealized Loss   44,000     16,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   581,000        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss   $ 51,000        
Available-for-sale Securities, Number of Shares   1,660        
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net   $ 771,173   $ 1,502,239    
Insignia [Member]            
Common Stock, Dividends, Per Share, Declared $ 0.70          
Insignia [Member]            
Available-for-sale Securities, Amortized Cost Basis   $ 1,724,000 2,463,000 $ 3,604,000 $ 2,463,000 $ 5,106,000
Available-for-sale Securities, Ownership Percentage   14.00%        
Available-for-sale Securities, Acquired During Period, Amortized Cost Basis   $ 32,000        
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net   $ 3,414,000        
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities     $ 112,000