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Obligations Under Finance Leases (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Oct. 31, 2018
Dec. 31, 2016
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2009
Obligation under capital leases [Abstract]              
Present value of lease liabilities $ 89,000            
Less current portion (89,000) $ (901,000)          
Capital lease obligations, noncurrent 0 89,000          
Finance Lease [Abstract]              
2021 90,000            
Total 90,000            
Less interest (1,000)            
Present value of lease liabilities $ 89,000            
Perfexion Gamma Knife [Member]              
Capital Lease [Abstract]              
Equipment financed term 7 years            
Capital lease asset under construction             $ 3,742,000
Monthly payments for capital leases           $ 78,000  
Modified equipment capitalized cost under agreement           $ 4,700,000  
Interest rate on lease           4.49%  
Obligation under capital leases [Abstract]              
Present value of lease liabilities $ 89,000 990,000          
Less current portion (89,000) (901,000)          
Capital lease obligations, noncurrent 0 89,000          
Finance Lease [Abstract]              
2021 90,000            
Total 90,000            
Less interest (1,000)            
Present value of lease liabilities $ 89,000 $ 990,000          
Perfexion Gamma Knife, New Installation and Related Construction Costs [Member]              
Capital Lease [Abstract]              
Equipment financed term 72 months            
Perfexion Gamma Knife, Further Installation and Related Construction Costs [Member]              
Capital Lease [Abstract]              
Equipment financed term 24 months            
Lease amount for cost of construction         $ 250,000    
ICON Imaging Technology [Member]              
Capital Lease [Abstract]              
Equipment financed term 48 months            
Monthly payments for capital leases       $ 20,000      
Interest rate on lease       4.45%      
Obligation under capital leases [Abstract]              
Present value of lease liabilities       $ 879,000      
Finance Lease [Abstract]              
Present value of lease liabilities       $ 879,000      
Gamma Knife, Cobalt Reload [Member]              
Capital Lease [Abstract]              
Equipment financed term 30 months            
Monthly payments for capital leases     $ 30,000        
Interest rate on lease     5.85%        
Obligation under capital leases [Abstract]              
Present value of lease liabilities     $ 833,000        
Finance Lease [Abstract]              
Present value of lease liabilities     $ 833,000