Note 17 - Commitments and Contingencies (Details Textual) $ in Thousands	Dec. 31, 2019 USD ($)
Lessee, Operating Lease, Liability, Payments, Due, Total	$ 1,248
Capital Addition Purchase Commitments [Member] \| Revenue Equipment [Member]
Purchase Obligation, Future Minimum Payments, Remainder of Fiscal Year	$ 90,900

Minimum amount of purchase arrangement maturing in the remainder of the fiscal year following the latest fiscal year ended. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

No definition available.

Name:	us-gaap_PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant