Amount of operating lease expense. Excludes sublease income.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977

Name:	us-gaap_OperatingLeaseExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

LEASES - Other (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
LEASES - Other (Details) $ in Thousands	Jul. 31, 2020 item	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Lease details
Noncancellable commitments for purchases of equipment		$ 0		$ 0
Lease rent expense		$ 40	$ 40	$ 80	$ 80
Tractors
Lease details
Number of units under lease agreement \| item	189