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Note 3 - Investments in Securities (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 12 Months Ended
Jan. 06, 2017
Mar. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Jun. 30, 2016
Jun. 29, 2016
Marketable Securities   $ 4,594,000 $ 4,594,000 $ 9,656,000    
Available-for-sale Securities, Amortized Cost Basis   4,331,000 4,331,000 9,791,000    
Available-for-sale Securities, Gross Unrealized Gain     279,000 422,000    
Available-for-sale Securities, Gross Unrealized Loss     16,000 557,000    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   441,000 441,000 5,903,000    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss     2,771,000 163,000    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   0 0 4,711,000    
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss       395,000    
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments     576,162 $ 49,720    
Insignia [Member]            
Common Stock, Dividends, Per Share, Declared $ 0.70          
Insignia [Member]            
Available-for-sale Securities, Amortized Cost Basis   $ 2,068,000 $ 2,068,000   $ 3,604,000 $ 4,711,000
Available-for-sale Securities, Number of Shares   1,650 1,650      
Available-for-sale Securities, Ownership Percentage   14.00% 14.00%      
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities   $ 112,000 $ 2,643,000