Note 20 - Subsequent Event (Details Textual) $ in Millions	Jan. 31, 2022 USD ($)
Subsequent Event [Member] \| Discontinued Operations, Disposed of by Sale [Member] \| Zenith Freight Lines [Member]
Disposal Group, Including Discontinued Operation, Consideration	$ 87

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

No definition available.

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant