Note 11 - Discontinued Operations (Details Textual) - USD ($) $ in Thousands	May 31, 2020	Dec. 04, 2018
Consolidation of Nelco Products, Inc. and Neltec, Inc. [Member]
Restructuring and Related Cost, Expected Cost Remaining	$ 74
Electronics Business [Member] \| Discontinued Operations, Disposed of by Sale [Member]
Disposal Group, Including Discontinued Operation, Consideration		$ 145,000

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