Revolving Credit Facilities and Mortgage Payable - Mortgage (Details) - USD ($)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jul. 31, 2014
Debt Instrument [Line Items]
Short-term borrowings	$ 578,000	$ 550,000
Mortgage payable	31,504,000	$ 32,082,000
Mortgages
Debt Instrument [Line Items]
Debt instrument face amount			$ 33,900,000
Long-term debt gross	32,082,000
Short-term borrowings	578,000
Mortgage payable	$ 31,504,000
Fixed interest rate	4.928%
Debt amortization period	30 years
Balloon payment to be paid	$ 23,700,000
Term for minimum payments	5 years
Annual principal payment	$ 3,195,000