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Note 10 - Stockholders' Equity (Details Textual)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jul. 12, 2021
$ / shares
shares
Jun. 17, 2021
USD ($)
shares
Jun. 17, 2021
USD ($)
shares
Jun. 15, 2021
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
$ / shares
shares
Mar. 31, 2023
USD ($)
$ / shares
Dec. 31, 2023
$ / shares
shares
Dec. 01, 2023
USD ($)
Sep. 15, 2022
USD ($)
Aug. 31, 2021
$ / shares
shares
Preferred Stock, Shares Authorized (in shares)         1,000,000          
Maximum Individual Common Stock Ownership, Percentage         9.80%          
Number of Limited Partnerships in which Company is Sole General Partner         5          
Commercial Property [Member]                    
Number of Real Estate Properties         12          
Commercial Property [Member] | Partially Owned Properties [Member]                    
Number of Real Estate Properties         2          
Class A Common Stock and Accompanying Common Stock Warrants [Member]                    
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 5                  
Class A Common Stock and Accompanying Pre-funded Warrants [Member]                    
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 4.99                  
Common Stock Warrants [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 2,000,000                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 5.5                  
Warrants and Rights Outstanding, Term (Year) 5 years                  
Pre-funded Warrants [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 1,000,000                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 0.01                  
Placement Agent Warrants [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                   80,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares                   $ 6.25
Warrants and Rights Outstanding, Term (Year)                   5 years
Class of Warrant or Right, Securities Called By Warrants or Rights, Percentage of Class of Stock                   4.00%
Common Stock Warrants and Placement Agent Warrants [Member]                    
Class of Warrant or Right, Exercised During Period (in shares)         0          
Series D Preferred Stock [Member]                    
Preferred Stock, Shares Authorized (in shares)         1,000,000   1,000,000      
Stock Issued During Period, Shares, New Issues (in shares)   920,000   800,000            
Shares Issued, Price Per Share (in dollars per share) | $ / shares       $ 25            
Proceeds from Issuance of Preferred Stock and Preference Stock | $   $ 20,500   $ 18,100            
Preferred Stock, Dividend Rate, Percentage         9.375%          
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares         $ 25   $ 25      
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share) | $ / shares         $ 2.34375          
Preferred Stock, Number of Board of Directors Entitled to Vote if Dividends not Paid for 18 Monthly Dividend Periods         2          
Preferred Stock, Percentage of Outstanding Shares Required to Authorize Senior Ranking Stock         66.67%          
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares         $ 25          
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ / shares         $ 0.58593 $ 0.58593        
Payments of Dividends | $         $ 500 $ 500        
Stock Repurchase Program, Authorized Amount | $               $ 4,000 $ 4,000  
Stock Repurchased During Period, Shares (in shares)         23,041          
Stock Repurchased, Average Cost Per Share (in dollars per share) | $ / shares         $ 16.06          
Stock Repurchased, Commission Per Share (in dollars per share) | $ / shares         $ 0.035          
Stock Repurchased During Period, Value | $         $ 400          
Series D Preferred Stock [Member] | Monthly Dividends [Member]                    
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ / shares         $ 0.19531          
Series D Preferred Stock [Member] | Over-Allotment Option [Member]                    
Stock Issued During Period, Shares, New Issues (in shares)     120,000              
Proceeds from Issuance of Preferred Stock and Preference Stock | $     $ 2,700              
Option to Purchase Additional Shares, Period (Day)       45 days            
Common Class A [Member]                    
Stock Issued During Period, Shares, New Issues (in shares) 1,000,000                  
Common Stock, Shares Authorized (in shares)         100,000,000   100,000,000      
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares         $ 0.01   $ 0.01      
Common Stock, Shares, Issued (in shares)         12,429,139   12,265,061      
Stock Repurchase Program, Authorized Amount | $               $ 6,000 $ 6,000  
Common Class B [Member]                    
Common Stock, Shares Authorized (in shares)         1,000          
Common Stock, Shares, Issued (in shares)         0          
Common Class C [Member]                    
Common Stock, Shares Authorized (in shares)         9,000,000          
Common Stock, Shares, Issued (in shares)         0          
Common Stock, Number of Entitled Votes         1          
Series A Common Stock [Member]                    
Payments of Dividends | $         $ 0 $ 300