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SALES OF PROPERTIES, PROPERTY HELD-FOR-SALE AND IMPAIRMENT LOSS - Property Held-for-Sale and Impairment loss (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2026
Jun. 26, 2026
May 12, 2026
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE                
Gain (loss) on sale of real estate, net   $ 13,433,000 $ 6,531,000 $ 17,309,000 $ 7,641,000      
Impairment loss   142,000   142,000        
Retail property in Monroeville, Pennsylvania | Forecast                
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE                
Gain (loss) on sale of real estate, net $ 887,000         $ 887,000    
Retail property in Chicago, Illinois                
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE                
Contracted sale price of property             $ 5,700,000  
Impairment loss   142,000   142,000        
Retail property in Chicago, Illinois | Forecast                
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE                
Gain (loss) on sale of real estate, net $ (280,000)         $ (280,000)    
Properties held-for-sale | Retail property in Monroeville, Pennsylvania                
SALES OF PROPERTIES AND PROPERTY HELD-FOR-SALE                
Contracted sale price of property               $ 2,050,000
Net book value   $ 1,054,000   $ 1,054,000