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INTEREST RATE SWAP DERIVATIVES (Details) - Interest Rate Swap [Member]
 3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Number
Dec. 31, 2017
USD ($)
Number
Derivatives, Fair Value [Line Items]    
Derivative Liability, Number of Instruments Held | Number 2 2
Derivative Variable Interest Rate Description One-month LIBOR + applicable spread/Fixed at 4.05%-4.34% [1] One-month LIBOR + applicable spread/Fixed at 4.05%-4.34%
Derivative, Remaining Maturity 7 years 7 years 2 months 12 days
Derivative, Average Fixed Interest Rate 4.16% 4.21%
Maximum [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Notional Amount | $ [2] $ 10,575,000 $ 10,620,000
[1] The reference rate was June 30, 2017 for two interest rate swaps.
[2] The notional amount of the Company’s swaps decreases each month to correspond to the outstanding principal balance on the related mortgage. The minimum notional amount (outstanding principal balance at the maturity date) as of December 31, 2017 was $9,083,700.