Revolving Credit Facilities and Mortgage Payable - Mortgage (Details) - USD ($)	Dec. 31, 2017	Mar. 31, 2017	Jul. 31, 2014
Debt Instrument [Line Items]
Short-term borrowings	$ 571,000	$ 549,000
Mortgage payable	31,656,000	$ 32,082,000
Mortgages
Debt Instrument [Line Items]
Debt instrument face amount			$ 33,900,000
Long-term debt gross	32,227,000
Short-term borrowings	571,000
Mortgage payable	$ 31,656,000