Note 8 - Receivables, Net (Details Textual) - USD ($) $ in Millions	Apr. 29, 2021	Mar. 31, 2021
Police Retirement System of St. Louis v. Granite Construction Incorporated, et al. [Member]
Loss Contingency, Receivable, Ending Balance	$ 63	$ 63

Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12053-110248

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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