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Revolving Credit Facilities and Mortgage Payable - Mortgage (Details) - USD ($)
Jun. 30, 2017
Mar. 31, 2017
Jul. 31, 2014
Debt Instrument [Line Items]      
Short-term borrowings $ 557,000 $ 549,000  
Mortgage payable 31,943,000 $ 32,082,000  
Mortgages      
Debt Instrument [Line Items]      
Debt instrument face amount     $ 33,900,000
Long-term debt gross 32,500,000    
Short-term borrowings 557,000    
Mortgage payable $ 31,943,000