Note 7 - Commitments and Contingent Liabilities (Details Textual) - USD ($) $ in Millions		3 Months Ended
May 02, 2018	Jan. 31, 2022
EPA Case Involving a Housing Redevelopment Project in Newark, New Jersey [Member]
Loss Contingency, Percentage of Plaintiff's Costs for Which Reimbursement is Demanded	100.00%
Loss Contingency, Damages Sought, Value	$ 2.7
Great Notch Condominium Claims[Member]
Loss Contingency, Damages Sought, Value		$ 119.5
Spill Fund Lawsuit [Member]
Loss Contingency, Damages Sought, Value		$ 5.3

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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