RELATED PARTY TRANSACTIONS (Details) $ in Thousands			3 Months Ended		9 Months Ended
	Aug. 28, 2015 USD ($) a ft² item	Sep. 30, 2004 USD ($)	Sep. 30, 2017 USD ($) ft²	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) ft²	Sep. 30, 2016 USD ($)
Biggest Little Investments, L.P. | BLI Parking Lot Lease
RELATED PARTY TRANSACTIONS
Lease term under each renewal	5 years
Biggest Little Investments, L.P. | BLI Driveway Lease
RELATED PARTY TRANSACTIONS
Lease term		15 years
Anniversary years subject to cost of living adjustment rent increases	5 years
Area of property leased (in square feet) | ft²			37,400		37,400
Original annual rent expense		$ 300
Annual rent					$ 377
Number of terms for which the lease can be renewed | item	3
Lease rent paid			$ 94	$ 94	282	$ 282
Operating expenses related to lease			8	5	19	30
Affiliates | Leases for billboard advertising, storage space and parking lot space
RELATED PARTY TRANSACTIONS
Lease rent paid			36	35	96	93
Golden Road | Biggest Little Investments, L.P. | BLI Parking Lot Lease
RELATED PARTY TRANSACTIONS
Lease term	20 years
Area of building being demolished (in square feet) | ft²	46,000
Area of property leased (in acres) | a	4.15
Number of parking spaces | item	300
Minimum annual rent	$ 695
Anniversary years subject to cost of living adjustment rent increases	5 years
Lease term under each renewal	10 years
Amount due to related party if lease is not renewed	$ 1,600
Lease rent paid			174	174	522	522
Operating expenses related to lease			$ 15	$ 13	$ 23	$ 49