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BUSINESS SEGMENT DATA - Summary of Operations in Different Segments (Details) - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
BUSINESS SEGMENT DATA      
Total Revenues $ 24,717,000 $ 17,210,000  
Total Operating Income 2,957,000 3,486,000  
Provision for Impairment (479,000)    
Loss on Disposition of Assets   (245,000)  
Depreciation and Amortization 10,316,000 6,369,000  
Capital Expenditures 23,859,000 40,515,000  
Identifiable Assets 981,254,000   $ 986,545,000
Operating Segments      
BUSINESS SEGMENT DATA      
Provision for Impairment (479,000)    
Loss on Disposition of Assets   (245,000)  
General and Corporate Expense      
BUSINESS SEGMENT DATA      
Total Operating Income (14,043,000) (9,412,000)  
Depreciation and Amortization 14,000 13,000  
Capital Expenditures 25,000 16,000  
Identifiable Assets 31,852,000   46,438,000
Income Properties      
BUSINESS SEGMENT DATA      
Total Revenues 22,432,000 15,168,000  
Provision for Impairment 0 0  
Income Properties | Operating Segments      
BUSINESS SEGMENT DATA      
Total Operating Income 15,279,000 11,152,000  
Depreciation and Amortization 10,302,000 6,356,000  
Capital Expenditures 7,773,000 40,499,000  
Identifiable Assets 896,537,000   902,427,000
Management Fee Income      
BUSINESS SEGMENT DATA      
Total Revenues 1,098,000 936,000  
Management Fee Income | Operating Segments      
BUSINESS SEGMENT DATA      
Total Operating Income 1,098,000 936,000  
Capital Expenditures 0 0  
Identifiable Assets 1,505,000   1,370,000
Interest Income From Commercial Loans and Investments      
BUSINESS SEGMENT DATA      
Total Revenues 795,000 718,000  
Provision for Impairment (500,000) 0  
Interest Income From Commercial Loans and Investments | Operating Segments      
BUSINESS SEGMENT DATA      
Total Operating Income 795,000 718,000  
Capital Expenditures 16,061,000    
Identifiable Assets 47,368,000   32,269,000
Real Estate Operations      
BUSINESS SEGMENT DATA      
Total Revenues 392,000 388,000  
Capital Expenditures 0 0  
Real Estate Operations | Operating Segments      
BUSINESS SEGMENT DATA      
Total Operating Income 307,000 $ 337,000  
Identifiable Assets $ 3,992,000   $ 4,041,000