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Note 3 - Statements of Net Assets (Details Textual)
 12 Months Ended 24 Months Ended
Dec. 31, 2020
USD ($)
ft²
$ / shares
shares
Dec. 31, 2019
USD ($)
ft²
$ / shares
Dec. 31, 2022
USD ($)
Dec. 31, 2018
USD ($)
Medical Office [Member]        
Area of Real Estate Property (Square Foot) | ft²   100,000    
Retail [Member]        
Area of Real Estate Property (Square Foot) | ft² 1,500 4,000    
Multitenant Residential [Member]        
Number of Units in Real Estate Property   200    
Basis of Accounting, Liquidation [Member]        
Net Assets, Ending Balance $ 22,487,944 $ 31,369,637   $ 26,846,670
Liquidation Basis of Accounting, Common Stock Per Share, Net (in dollars per share) | $ / shares $ 15.17 $ 21.16    
Common Stock, Shares, Outstanding, Ending Balance (in shares) | shares 1,482,680      
Liquidation Basis of Accounting, Net Increase (Decrease) in Liquidation Value $ (8,881,693) $ 4,522,967    
Liquidation Basis of Accounting, Net Increase (Decrease) in Liquidation Value Per Share (in dollars per share) | $ / shares $ (5.99)      
Liquidation Basis of Accounting Change in Liquidation Value of Real Estate $ (9,220,000) 12,068,730    
Liquidation Basis of Accounting, Remeasurement Gain (Loss) on Liability Retention Bonus Payments to Executives and Other Employees 1,767,038 [1] (2,710,358) [2]    
Liquidation Basis of Accounting, Remeasurement Gain (Loss) on Liability Selling Costs on Real Estate Assets 439,203 [1] $ (1,060,124) [2]    
Liquidation Basis of Accounting, Increase (Decrease) in Net Assets in Liquidation Value $ 7,013,759      
Liquidation Basis of Accounting, Increase (Decrease) in Net Assets in Liquidation Value, Per Share (in dollars per share) | $ / shares $ 4.73      
Liquidation Basis of Accounting, Land Entitlement Costs Incurred $ 1,000,000      
Liquidation Basis of Accounting, Common Stock Per Share (in dollars per share) | $ / shares $ 15.17 $ 21.16    
Basis of Accounting, Liquidation [Member] | Change from Partly Residential Use to All Medical [Member]        
Liquidation Basis of Accounting Change in Liquidation Value of Real Estate $ 3,820,000      
Basis of Accounting, Liquidation [Member] | Market Driven Decline in Real Estate Value [Member]        
Liquidation Basis of Accounting Change in Liquidation Value of Real Estate $ 5,400,000      
Forecast [Member]        
Liquidation Basis of Accounting, Land Entitlement Costs     $ 1,500,000  
Liquidation Basis of Accounting, Land Entitlement Costs Incurred, Amount Deferred     $ 321,000  
[1] The amounts reported are based on the provisions of the retention bonus plan and the reported amount of the real estate assets estimated net realizable value. Based on the estimated real estate value of the Cortlandt property, aggregate proceeds from the sale of the two Cortlandt lots would not exceed the adjusted floor under the retention bonus plan and therefore the above table only reflects the projected bonus from the sale of the Flowerfield property.
[2] The amounts reported are based on the provisions of the retention bonus plan and the reported amount of the real estate assets estimated net realizable value.