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Note 3 - Statements of Net Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Real Estate Properties [Table Text Block]
   
2020
    
2019
  
Net Realizable Value at beginning of period
   $
48,270,000
     $
36,201,270
  
Change in Net Realizable Value
  
 
 
 
  
 
 
 
Cortlandt Manor
    
(3,820,000
 )    
2,010,000
  
Flowerfield
    
(5,400,000
 )    
10,058,730
  
Net Realizable Value on December 31,
   $
39,050,000
     $
48,270,000
  
Cortlandt Manor Property In New York [Member]  
Notes Tables  
Schedule of Real Estate Properties [Table Text Block]
SUBDIVISION LOT #
BUILDING SIZE/YIELD
Medical office Lot #1
100,000 sft
Retail (Lot #1)
Medical Office Lot #2
1,500 sft
84,600 sft