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Revolving Credit Facilities and Mortgage Payable - Mortgage (Details) - USD ($)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Jul. 31, 2014
Debt Instrument [Line Items]        
Repayments of mortgage principal $ 30,901,000 $ 603,000 $ 578,000  
Mortgages        
Debt Instrument [Line Items]        
Debt instrument face amount       $ 33,931,000
Fixed interest rate       4.928%
Repayments of mortgage principal 31,578,000      
Outstanding balance $ 0