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Goodwill and Intangible Assets, Amortization Expense (Details) - USD ($)
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Amortization expense for acquired intangible assets [Abstract]      
Amortization expense $ 1,770,000 $ 1,194,000 $ 710,000
Estimated future amortization expense for intangible assets subject to amortization [Abstract]      
2021 1,479,000    
2022 1,438,000    
2023 1,408,000    
2024 1,040,000    
2025 471,000    
Thereafter 557,000    
Total $ 6,393,000