XML 46 R35.htm IDEA: XBRL DOCUMENT v3.20.1
Supplementary Financial Information - Future Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Future estimated amortization expense    
2021 $ 1,419  
2022 1,234  
2023 1,010  
2024 879  
2025 849  
Thereafter 746  
Net Book Value $ 6,137 $ 3,286