Note 1 - General	3 Months Ended
Mar. 31, 2023
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. General Basis of Presentation: The condensed consolidated financial statements included herein have been prepared by Granite Construction Incorporated (“we,” “us,” “our,” the “Company” or “Granite”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), are unaudited and should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2022 (“Annual Report”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) have been condensed or omitted. Further, the condensed consolidated financial statements reflect, in the opinion of management, all normal recurring adjustments necessary to state fairly our financial position at March 31, 2023 and 2022 and the results of our operations and cash flows for the periods presented. The December 31, 2022 condensed consolidated balance sheet data included herein was derived from audited consolidated financial statements but does not include all disclosures required by U.S. GAAP. Seasonality: Our operations are typically affected more by weather conditions during the first and fourth quarters of our fiscal year which may alter our construction schedules and can create variability in our revenues and profitability. Therefore, the results of operations for the three months ended March 31, 2023 are not necessarily indicative of the results to be expected for the full year. Subsequent Event: On April 24, 2023, we completed the purchase of Coast Mountain Resources (2020) Ltd. (“CMR”) for approximately $27 million, subject to certain adjustments. CMR is a construction aggregate producer based in British Columbia, Canada operating on Malahat First Nation land. This acquisition is not expected to have a material impact on our results of operations.

Note 1 - General

3 Months Ended

Mar. 31, 2023

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

1. General

Basis of Presentation: The condensed consolidated financial statements included herein have been prepared by Granite Construction Incorporated (“we,” “us,” “our,” the “Company” or “Granite”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), are unaudited and should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2022 (“Annual Report”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) have been condensed or omitted. Further, the condensed consolidated financial statements reflect, in the opinion of management, all normal recurring adjustments necessary to state fairly our financial position at March 31, 2023 and 2022 and the results of our operations and cash flows for the periods presented. The December 31, 2022 condensed consolidated balance sheet data included herein was derived from audited consolidated financial statements but does not include all disclosures required by U.S. GAAP.

Seasonality: Our operations are typically affected more by weather conditions during the first and fourth quarters of our fiscal year which may alter our construction schedules and can create variability in our revenues and profitability. Therefore, the results of operations for the three months ended March 31, 2023 are not necessarily indicative of the results to be expected for the full year.

Subsequent Event: On April 24, 2023, we completed the purchase of Coast Mountain Resources (2020) Ltd. (“CMR”) for approximately $27 million, subject to certain adjustments. CMR is a construction aggregate producer based in British Columbia, Canada operating on Malahat First Nation land. This acquisition is not expected to have a material impact on our results of operations.