LEASE COMMITMENTS - Driveway and Parking Lot Leases (Details) $ in Thousands			1 Months Ended	12 Months Ended
	Aug. 28, 2015 USD ($) ft² a item	Sep. 30, 2004 USD ($)	Sep. 30, 2004 USD ($)	Dec. 31, 2018 USD ($) ft²	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Nov. 17, 2015 USD ($)
LEASE COMMITMENTS
Leasehold improvements				$ 3,782	$ 3,800
Driveway Lease
LEASE COMMITMENTS
Operating expenses related to lease		$ 1,350
Biggest Little Investments, L.P. (BLI) | Parking Lot Lease
LEASE COMMITMENTS
Number of parking spaces | item	300
Minimum annual rent							$ 695
Anniversary years subject to cost of living adjustment rent increases	5 years
Lease renewal option additional term	10 years
Amount due to related party if lease is not renewed	$ 1,600
Minimum rent expense				695	695	$ 695
Operating expenses related to lease				$ 21	31	60
Biggest Little Investments, L.P. (BLI) | Driveway Lease
LEASE COMMITMENTS
Lease term		15 years	15 years
Area of property | ft²				37,400
Minimum annual rent		$ 300	$ 300
Anniversary years subject to cost of living adjustment rent increases			5 years
Total cost of improvements				$ 2,000
Cost of improvements, useful life		15 years
Number of terms for which the lease can be renewed | item	3
Lease renewal option additional term	5 years
Minimum rent expense				377	377	377
Operating expenses related to lease				$ 22	$ 24	$ 37
Golden Road | Biggest Little Investments, L.P. (BLI) | Parking Lot Lease
LEASE COMMITMENTS
Lease term	20 years
Golden Road | Biggest Little Investments, L.P. (BLI) | Parking Lot Lease | Buildings
LEASE COMMITMENTS
Area of property | ft²	46,000
Area of land | a	4.2