Note 1 - Consolidated Financial Statements (Details Textual) $ in Millions	Jul. 25, 2018 USD ($)
Discontinued Operations, Held-for-sale [Member] \| Electronics Business [Member]
Disposal Group, Including Discontinued Operation, Consideration	$ 145

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