INCOME TAXES Effective tax rate reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount
Tax expense (benefit) computed at the maximum U.S. statutory rate, amount	$ 284	$ (3,820)
Difference resulting from state income taxes, net of federal income tax benefits, amount	(348)	(483)
State tax rate difference	43
Non-deductible expenses, other, amount	130	136
Change in net operating loss carryforward, amount	2,705	(581)
Change in valuation allowance, amount	(1,534)	(2,136)
Change in foreign tax credits, amount	2,288	1,811
Bankruptcy reorg costs	(2,533)
Other, net, amount	702	(673)
Total tax expense (benefit), amount	$ 333	$ (4,400)
Effective Income Tax Rate Reconciliation, Percent
Tax expense (benefit) computed at the maximum U.S. statutory rate, as a percent	21.00%	21.00%	35.00%
Difference resulting from state income taxes, net of federal income tax benefits, percentage	(25.70%)	2.70%
State tax rate difference, percentage	3.20%
Non-deductible expenses, other, percentage	9.60%	(0.70%)
Change in net operating loss carryforward, percentage	199.60%	3.20%
Change in valuation allowance, percentage	(113.20%)	11.70%
Change in foreign tax credits, percentage	168.90%	(10.00%)
Bankruptcy reorg costs, percentage	(187.00%)
Other, net, percentage	(51.80%)	(3.70%)
Total tax expense (benefit), percentage	24.60%	24.20%