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LONG-TERM DEBT
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
LONG-TERM DEBT LONG TERM DEBT
Long-term debt consists primarily of 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 at December 31, 2019. These notes are payable in 36 to 84 fully amortizing monthly installments, mature between April 2020 and March 2026, and are collateralized by the respective Gamma Knife units. The notes accrue interest at fixed annual rates between 5.25% and 6.90%.
As of December 31, 2018, the Company had seven notes with three financing companies collateralized by the Gamma Knife equipment, the individual customer contracts and related accounts receivable, having an aggregate net book value of $13,016,000.
The following are contractual maturities of long-term debt by year at December 31, 2019:
Year ending December 31,PrincipalInterest
2020$1,526,000  $163,000  
2021711,000  101,000  
2022263,000  71,000  
2023280,000  54,000  
2024299,000  36,000  
Thereafter401,000  17,000  
$3,480,000  $442,000