INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current [Abstract]
Federal	$ 0	$ 0	$ 0
State	115	200	150
Total	115	200	150
Deferred [Abstract]
Federal	120	0	(424)
State	33	0	0
Total	153	0	(424)
Total provision (benefit)	268	200	(274)
Effective income tax rate reconciliation, amount [Abstract]
Income (loss) before taxes	2,283	(6,345)	(11,758)
Expected tax (benefit)	479	(1,332)	(4,115)
State tax benefit (net of federal)	148	200	150
Valuation allowance	(428)	1,230	(13,920)
Federal tax reform - deferred rate change	0	49	17,671
Other	69	53	(60)
Total provision (benefit)	$ 268	$ 200	$ (274)
Effective income tax rate reconciliation, percent [Abstract]
Federal corporate tax rate	21.00%	21.00%	35.00%
State tax benefit (net of federal)	6.50%	(3.20%)	(1.30%)
Valuation allowance	(18.80%)	(19.40%)	118.40%
Federal tax reform - deferred rate change	0.000	(0.008)	(1.503)
Other	3.00%	(0.80%)	0.50%
Total	11.70%	(3.20%)	2.30%
Gross noncurrent deferred tax (liabilities) assets [Abstract]
Allowance for bad debts	$ 5,461	$ 4,828
Accrued rent	0	1,833
Stock-based compensation	178	18
Lease liability	14,822	0
Right-of-use asset	(13,156)	0
163J interest limitation	0	19
Depreciation	10,981	16,259
Goodwill	(766)	(98)
Other intangibles	135	211
Pension plan liabilities	1,286	1,163
Net operating loss carryforwards	18,261	17,927
AMT credit	0	424
Gross noncurrent deferred tax assets, net	37,202	42,584
Less valuation allowance	(37,355)	(42,160)
Noncurrent deferred tax (liabilities) assets, net	$ (153)
Noncurrent deferred tax (liabilities) assets, net		424
Percentage refunded for AMT credit deferred tax asset	50.00%
AMT credit receivables	$ 400
Net operating loss carryforwards	$ 66,700		$ 58,500
Net operating losses		$ 8,200
Net operating loss carryforwards, period of ownership change	3 years
Net operating loss carryforwards, minimum percentage of ownership change	50.00%