INCOME TAXES - NOL (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) Y item	Dec. 31, 2019 USD ($)
Operating loss and contribution carryforwards
Valuation allowance	$ 1,284	$ 668
Number of state taxing authorities for which the entity is under examination | item	1
State
Operating loss and contribution carryforwards
Operating loss carryforwards	$ 18,400
Net operating loss and contribution carryforwards expiration period	20 years
Number of prior years with taxable losses | Y	3
Valuation allowance related to net operating loss carryforwards	$ 600
Amount of tax credit carryforward reserved	200
Valuation allowance, tax credit carryforwards	200
State tax department of Panther
Operating loss and contribution carryforwards
Operating loss carryforwards	5,300
State tax department of other subsidiaries
Operating loss and contribution carryforwards
Operating loss carryforwards	11,600
Foreign
Operating loss and contribution carryforwards
Valuation allowance	400	$ 700
Federal
Operating loss and contribution carryforwards
Operating loss carryforwards	1,300
Operating loss carryforwards, expire within five years	1,000
Operating loss carryforwards, expire in ten years	$ 300
Net operating loss and contribution carryforwards expiration period	10 years
Number of prior years with taxable losses | Y	3
Valuation allowance related to net operating loss carryforwards	$ 100
Minimum | State tax department of Panther
Operating loss and contribution carryforwards
Net operating loss and contribution carryforwards expiration period	10 years
Maximum | State tax department of Panther
Operating loss and contribution carryforwards
Net operating loss and contribution carryforwards expiration period	20 years
Maximum | Federal
Operating loss and contribution carryforwards
Net operating loss and contribution carryforwards expiration period	5 years