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Note 3 - Real Estate (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Oct. 31, 2023
Sep. 29, 2023
Jul. 20, 2023
Jun. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Business Acquisition [Line Items]                  
Impairment of real estate assets held for sale         $ 396 $ 0   $ 2,353 $ 0
Spotswood Valley Square Shopping Center [Member]                  
Business Acquisition [Line Items]                  
Sales price       $ 23,000          
Gain (loss) on sales of real estate       11,600          
Repayments of secured debt             $ 11,800    
Transaction costs       $ 600          
Dekalb Plaza [Member]                  
Business Acquisition [Line Items]                  
Impairment of real estate assets held for sale         $ 400     $ 2,400  
Sales price     $ 23,100            
Gain (loss) on sales of real estate     (100)            
Transaction costs     700            
Lamont Street Preferred Interest [Member]                  
Business Acquisition [Line Items]                  
Repayments of secured debt             $ 2,300    
Basis Term Loan [Member]                  
Business Acquisition [Line Items]                  
Repayments of secured debt   $ 14,300 17,400            
Basis Term Loan [Member] | Subsequent Event [Member]                  
Business Acquisition [Line Items]                  
Repayments of secured debt $ 12,800                
Basis Term Loan [Member] | Dekalb Plaza [Member]                  
Business Acquisition [Line Items]                  
Repayments of secured debt     $ 17,400