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Note 7 - Real Estate (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Real Estate Properties [Table Text Block]
   
2019
    
2018
  
Net Realizable Value at beginning of period
   $
36,201,270
     $
33,016,665
  
Increases in Net Realizable Value
  
 
 
 
  
 
 
 
Cortlandt Manor
    
2,010,000
      
1,040,000
  
Flowerfield
    
10,058,730
      
2,944,605
  
Less Property Sales
  
 
 
 
  
 
 
 
Port Jefferson Professional Park
    
-
      
(800,000
 )
Net Realizable Value at December 31,
   $
48,270,000
     $
36,201,270