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LONG TERM DEBT
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
LONG TERM DEBT LONG TERM DEBT
Long-term debt consists primarily of seven notes with three financing companies collateralized by the Gamma Knife equipment having an aggregate net book value of $11,023,000, the individual customer contracts, and related accounts receivable of $1,718,000 at December 31, 2020. These notes are predominantly payable in 36 to 84 fully amortizing monthly installments, mature between January 2021 and September 2027. The notes accrue interest at fixed annual rates between 3.67% and 6.90%.
As of December 31, 2019, the Company had six notes with two financing companies collateralized by the Gamma Knife equipment having an aggregate net book value of $13,130,000, the individual customer contracts, and related accounts receivable of $1,848,000.
The following are contractual maturities of long-term debt by year at December 31, 2020, excluding debt issuance costs of $27,000:
Year ending December 31,Principal
2021$1,157,000 
2022768,000 
2023802,000 
2024839,000 
2025592,000 
Thereafter466,000 
$4,624,000