RELATED PARTY TRANSACTIONS (Details) $ in Thousands				3 Months Ended		6 Months Ended
	Nov. 17, 2015 USD ($)	Aug. 28, 2015 a ft² item	Sep. 30, 2004 USD ($)	Jun. 30, 2021 USD ($) ft²	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) ft²	Jun. 30, 2020 USD ($)
Biggest Little Investments, L.P. (BLI) | Parking Lot Lease
RELATED PARTY TRANSACTIONS
Rent paid				$ 174	$ 174	$ 348	$ 348
Operating expenses related to lease				1	0	8	7
Right of use asset					10,400		10,400
Operating lease liability				$ 10,400		$ 10,400
Biggest Little Investments, L.P. (BLI) | Driveway Lease
RELATED PARTY TRANSACTIONS
Lease term			15 years
Area of property | ft²				37,400		37,400
Minimum annual rent			$ 300
Anniversary years subject to cost of living adjustment rent increases			5 years
Number of terms for which the lease can be renewed | item		3
Lease renewal option additional term		5 years
Rent paid				$ 101	101	$ 202	202
Operating expenses related to lease				5	1	13	8
Right of use asset				3,800		3,800
Operating lease liability				3,800		3,800
Affiliates | Billboard advertising, storage space and parking lot space
RELATED PARTY TRANSACTIONS
Rent paid				$ 52	$ 38	$ 94	$ 74
Golden Road | Parking Lot Lease | Buildings
RELATED PARTY TRANSACTIONS
Area of land | a		4.2
Golden Road | Parking Lot Lease | Land
RELATED PARTY TRANSACTIONS
Number of parking spaces | item		300
Golden Road | Biggest Little Investments, L.P. (BLI) | Parking Lot Lease
RELATED PARTY TRANSACTIONS
Lease term		20 years
Minimum annual rent	$ 695
Anniversary years subject to cost of living adjustment rent increases	5 years
Lease renewal option additional term				10 years		10 years
Lessee, Operating Lease, Existence of Option to Extend [true false]						true
Amount due to related party if lease is not renewed				$ 1,600		$ 1,600
Golden Road | Biggest Little Investments, L.P. (BLI) | Parking Lot Lease | Buildings
RELATED PARTY TRANSACTIONS
Area of property | ft²		46,000
Area of land | a		4.2