LONG-TERM DEBT (Details)		3 Months Ended	9 Months Ended
	Feb. 23, 2018	Sep. 30, 2018 USD ($) Property	Sep. 30, 2018 USD ($) Property	Dec. 31, 2017 USD ($)	Nov. 29, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Long-term debt [Abstract]
Deferred Financing Fees		$ (626,000)	$ (626,000)	$ (807,000)
Long term debt		24,374,000	24,374,000	52,593,000
Less current maturities		0	0	0
Long-term debt, excluding current maturities		24,374,000	24,374,000	52,593,000
Scheduled maturities of long-term debt [Abstract]
2018		0	0
2019		0	0
2020		25,000,000	25,000,000
Long term debt		25,000,000	25,000,000
Credit Agreement [Member]
Long-term debt [Abstract]
Long-term line of credit		$ 25,000,000	$ 25,000,000	53,400,000
Term of credit facility			38 months
Expiration date of credit facility			May 31, 2020
Number of properties owned | Property		4	4
Percentage of letters of credit margin against available funds in cash collateral			100.00%
Percentage of unused facility fee payable quarterly			0.50%
Minimum quarterly average aggregate balances to be maintained		$ 5,000,000
Bank fees if minimum quarterly average aggregate balances is not maintained			$ 12,500
Revolving Credit Facility 1 [Member]
Long-term debt [Abstract]
Interest rate on credit facility	6.00%		6.00%
Revolving Credit Facility 1 [Member] | Prime Rate [Member]
Long-term debt [Abstract]
Interest rate on credit facility	2.85%		2.50%
Letter of Credit [Member]
Long-term debt [Abstract]
Line of credit facility, maximum borrowing capacity					$ 10,000,000
Expiration date of credit facility			Apr. 01, 2017
Percentage of letter of credit fee, quarterly installment			1.75%
Letters of credit outstanding		5,500,000	$ 5,500,000	$ 7,200,000			$ 6,200,000
Maximum availability under the facility previously provided		9,500,000	9,500,000
Revolving Credit Facility 2 [Member]
Long-term debt [Abstract]
Line of credit facility, maximum borrowing capacity					25,000,000
Repayment of debt			$ 17,800,000
Revolving Credit Facility 2 [Member] | Prime Rate [Member]
Long-term debt [Abstract]
Interest rate on credit facility			3.50%
Revolving Credit Facility 3 [Member]
Long-term debt [Abstract]
Line of credit facility, maximum borrowing capacity					15,000,000
Expiration date of credit facility			May 31, 2019
Repayment of debt			$ 15,000,000
Revolving Credit Facility 3 [Member] | Prime Rate [Member]
Long-term debt [Abstract]
Interest rate on credit facility			3.50%
Credit Facility 1 [Member]
Long-term debt [Abstract]
Line of credit facility, maximum borrowing capacity					25,000,000
Maximum [Member] | Credit Agreement [Member]
Long-term debt [Abstract]
Line of credit facility, maximum borrowing capacity					$ 65,000,000	$ 55,000,000
Tranche A [Member] | Credit Agreement [Member]
Long-term debt [Abstract]
Long-term line of credit		$ 25,000,000	$ 25,000,000