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Note 8 - Receivables, Net (Details Textual) - USD ($) $ in Millions | Sep. 30, 2021 | Apr. 29, 2021
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Police Retirement System of St. Louis v. Granite Construction Incorporated, et al. [Member] |  |
Loss Contingency, Receivable, Ending Balance | $ 63 | $ 63

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- Definition Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable. + References 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=124440162&loc=d3e12053-110248 + Details
Name: | us-gaap_LossContingencyReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | srt_LitigationCaseAxis=gva_PoliceRetirementSystemOfStLouisVGraniteConstructionIncorporatedEtAlMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |