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Note 13 - Subsequent Events (Details Textual) - Subsequent Event [Member]
Dec. 31, 2020
shares
Jul. 02, 2020
Merger
Directors [Member] | 2020 Equity Incentive Plan [Member]    
Subsequent Event [Line Items]    
Restricted shares of common stock granted | shares 153,200  
2020 Real Estate Acquisitions [Member] | Lamar Station Plaza East [Member]    
Subsequent Event [Line Items]    
Number of merger closed | Merger   1