Revolving Credit Facilities and Mortgage Payable - Mortgage (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jul. 31, 2014	Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Short-term borrowings		$ 638,000	$ 603,000
Mortgage payable		30,263,000	$ 30,901,000
Mortgages
Debt Instrument [Line Items]
Debt instrument face amount	$ 33,931,000
Long-term debt gross		30,901,000
Short-term borrowings		638,000
Mortgage payable		$ 30,263,000
Fixed interest rate	4.928%
Debt amortization period	30 years
Balloon payment to be paid	$ 23,695,000
Term for minimum payments		5 years
Annual principal payment		$ 3,530,000