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Intangible Assets
12 Months Ended
Mar. 31, 2020
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets Intangible Assets
The following table provides the gross carrying amount and related accumulated amortization of definite-lived intangible assets:
 March 31, 2020March 31, 2019
 Gross Carrying
Amount
Accumulated
Amortization
Net Intangible Asset Gross Carrying
Amount
Accumulated
Amortization
Net Intangible Asset
Cost of customer lists$50,411,969  (27,215,464) 23,196,505  $37,183,018  (22,509,921) 14,673,097  
Value assigned to non-compete agreements10,054,643  (8,802,671) 1,251,972  9,164,643  (8,497,587) 667,056  
Total$60,466,612  (36,018,135) 24,448,477  $46,347,661  (31,007,508) 15,340,153  

The estimated amortization expense for intangible assets for future years ended March 31 is as follows: $5.0 million for 2021; $4.1 million for 2022; $3.6 million for 2023; $3.5 million for 2024; $3.1 million for 2025; and an aggregate of $5.1 million for the years thereafter.