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LONG-TERM DEBT (Details)
3 Months Ended
Oct. 14, 2020
USD ($)
nursing_center
Mar. 31, 2021
USD ($)
letter_of_credit
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Acquisition Loan        
Line of Credit Facility [Line Items]        
Borrowing capacity       $ 12,500,000
Affiliated Revolving Credit Agreement        
Line of Credit Facility [Line Items]        
Borrowing capacity       2,000
Amended And Restated Credit Agreement        
Line of Credit Facility [Line Items]        
Number of owned nursing centers to secure Amended Mortgage Loan | nursing_center 15      
Number of letters of credit | letter_of_credit   4    
Amended And Restated Credit Agreement | Mortgage Term Loan | LIBOR        
Line of Credit Facility [Line Items]        
Interest rate percentage 4.00%      
Amended And Restated Credit Agreement | Mortgage Term Loan | Base Rate        
Line of Credit Facility [Line Items]        
Interest rate percentage 1.00%      
Mortgage Loan | Loans Payable        
Line of Credit Facility [Line Items]        
Borrowings outstanding   $ 60,767,000    
Mortgage Loan        
Line of Credit Facility [Line Items]        
Borrowing capacity       67,500,000
Mortgage Loan | Amended And Restated Credit Agreement        
Line of Credit Facility [Line Items]        
Borrowing capacity $ 62,000,000      
Period of amortization 25 years      
Mortgage Loan | Amended And Restated Credit Agreement | Mortgage Term Loan        
Line of Credit Facility [Line Items]        
Interest rate during period   5.00%    
Amended Revolver        
Line of Credit Facility [Line Items]        
Borrowing capacity       $ 40,250,000
Amended Revolver | Affiliated Revolving Credit Agreement        
Line of Credit Facility [Line Items]        
Borrowings outstanding   $ 0 $ 0  
Amended Revolver | Amended And Restated Credit Agreement        
Line of Credit Facility [Line Items]        
Borrowing capacity $ 2,000,000 $ 24,377,000    
Debt instrument term 3 years      
Interest rate during period   5.00%    
Letters of credit security deposit for a lease   $ 12,387,000    
Balance available for borrowing under revolving credit center   $ 11,990,000    
Amended Revolver | Mortgage Loan        
Line of Credit Facility [Line Items]        
Borrowing capacity $ 36,000,000      
Letter of Credit | Amended And Restated Credit Agreement        
Line of Credit Facility [Line Items]        
Annual fees for letters of credit issued under revolver (as a percentage)   3.00%