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Note 4 - Revisions in Estimates (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Schedule of Change in Accounting Estimate [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Number of projects with downward estimate changes |  |  | 2 |  |  |  | 3 |  |  |  | 5 |  |  |  | 6 |
Amount/range of reduction in gross profit from each project, net |  | $ | 5.7 - 10.9 |  |  | $ | 7.2 - 17.8 |  |  | $ | 5.5 - 16.2 |  |  | $ | 6.5 - 37.6 |
Decrease to project profitability |  |  | 16.6 |  |  |  | 32.2 |  |  |  | 48.2 |  |  |  | 107.5 |
Decrease to net income/increase to net loss |  |  | 13.0 |  |  |  | 21.7 |  |  |  | 37.7 |  |  |  | 72.6 |
Amounts attributable to non-controlling interests |  |  | 5.5 |  |  |  | 8.9 |  |  |  | 10.0 |  |  |  | 26.3 |
Decrease to net income/increase to net loss attributable to Granite Construction Incorporated |  |  | 7.5 |  |  |  | 12.8 |  |  |  | 27.7 |  |  |  | 46.3 |
Decrease to net income/increase to net loss per diluted share attributable to common shareholders (1) |  |  | 0.16 |  |  |  | 0.28 |  |  |  | 0.58 |  |  |  | 1.01 |

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- Definition Tabular disclosure of the change in an accounting estimate, including a change that occurs in an interim period. If a change in accounting estimate affects several future periods (for example, a change in the service life of a depreciable asset) disclose the effect on income from continuing operations, net income (or other appropriate captions of changes in the applicable net assets or performance indicator), and any related per-share amounts of the current period. Disclosure of the effects of a change in an accounting estimate that occurs in the ordinary course of business (such as uncollectible accounts or inventory obsolescence) is not required, unless the effect is material. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124437754&loc=d3e777-108305 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22595-107794 + Details
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