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Note 4 - Real Estate - (Details Textual)
12 Months Ended
Jul. 02, 2020
USD ($)
shares
Jan. 10, 2020
USD ($)
Dec. 31, 2019
USD ($)
property
Dec. 27, 2019
property
Business Acquisition [Line Items]        
Number of real estate properties | property     10  
2019 Real Estate Acquisitions [Member]        
Business Acquisition [Line Items]        
Initial merger date     Dec. 27, 2019  
Number of real estate properties | property     10 10
Total consideration for properties acquired     $ 130,770,000  
Transaction costs capitalized for asset acquisitions     $ 4,200,000  
2020 Real Estate Acquisitions [Member] | Subsequent Event [Member] | Lamar Station Plaza East [Member]        
Business Acquisition [Line Items]        
Total consideration for properties acquired $ 4,300,000      
Cash paid to prior investors 200,000      
Assumption of debt $ 2,500,000      
2020 Real Estate Acquisitions [Member] | Subsequent Event [Member] | Lamar Station Plaza East [Member] | Common Stock [Member]        
Business Acquisition [Line Items]        
Equity interest issued as consideration for the mergers | shares 884,143      
2020 Real Estate Acquisitions [Member] | Subsequent Event [Member] | Lamar Station Plaza East [Member] | Loan Agreement [Member]        
Business Acquisition [Line Items]        
Maximum principal amount $ 4,100,000      
2020 Real Estate Acquisitions [Member] | Subsequent Event [Member] | Cromwell Field Shopping Center [Member]        
Business Acquisition [Line Items]        
Business acquisition amount for fee simple interest in land   $ 2,200,000    
Business acquisition amount for mortgage on land   $ 1,400,000