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Note 2 - Significant Accounting Policies (Details Textual)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Amortization of above and below Market Leases $ 14,000 $ 4,000 $ 41,000 $ 6,000  
Amortization of Intangible Assets 50,000 68,000 152,000 275,000  
Deferred Costs, Total 1,200,000   1,200,000   $ 1,400,000
Operating Lease, Initial Direct Cost Expense, over Term 94,000 $ 85,000 283,000 $ 257,000  
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance 18,569,075   18,569,075   14,702,089
Restricted Cash, Total 4,900,000   4,900,000   4,700,000
Cash, Uninsured Amount $ 10,700,000   $ 10,700,000   7,300,000
Number of Real Estate Properties Held for Sale 1   1    
Unamortized Deferred Stock Costs $ 117,000   $ 117,000   135,000
Marketable Securities, Total 819,144   819,144   1,514,483
Marketable Securities, Cost Basis 1,000,000.0   1,000,000.0   1,600,000
Fair Value, Inputs, Level 1 [Member]          
Marketable Securities, Total $ 800,000   $ 800,000   $ 1,500,000
Maximum [Member]          
Amortization of Value In Place Leases (Year)     10 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Life Used for Depreciation (Year)     5 years    
Minimum [Member]          
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Life Used for Depreciation (Year)     1 year    
SPAC, Murphy Canyon Acquisition Corp. [Member]          
Equity Method Investment, Ownership Percentage 23.50%   23.50%