Note 9 - Construction Joint Ventures - Schedule of Unconsolidated Construction Joint Ventures Revenue and Costs (Details) - USD ($) $ in Thousands		3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
		Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cost of revenue			$ 893,855	$ 751,681	$ 593,794					$ 1,345,475	$ 2,239,330	$ 2,931,762	$ 3,139,220	$ 3,217,671
Increase to net income/decrease to net loss		$ 19,176	$ 65,198	$ 19,578	$ (25,095)	$ (20,433)	$ 32,423	$ 55,747	$ (65,323)	$ (5,517)	$ 59,681	78,857	2,414	(166,181)
Granite’s interest in net income (loss) (2)												(19,676)	(765)	(51,486)
Collaborative Arrangement [Member]
Revenue												120,157	294,064	359,236
Cost of revenue												139,538	295,045	410,675
Granite’s interest in gross profit (loss)												(19,381)	(981)	(51,439)
Granite’s interest in net income (loss) (2)	[1]											(19,676)	(768)	(51,486)
Collaborative Arrangement [Member] | Corporate Joint Venture [Member]
Revenue												330,835	820,586	918,716
Cost of revenue												378,237	835,899	1,193,358
Increase to net income/decrease to net loss												(47,904)	(15,533)	(274,410)
Collaborative Arrangement [Member] | Co-venturer [Member] | Other Partners Interest in Partnerships [Member]
Revenue	[2]											210,678	526,522	559,480
Cost of revenue	[2]											238,699	540,854	782,683
Increase to net income/decrease to net loss	[2]											$ (28,228)	$ (14,765)	$ (222,924)

[1] These joint ventures net income (loss) amounts exclude our corporate overhead required to manage the joint ventures and include taxes only to the extent the applicable states have joint venture level taxes.

[2] Partners’ interest and adjustments includes amounts to reconcile total revenue and total cost of revenue as reported by our partners to Granite’s interest adjusted to reflect our accounting policies and estimates primarily related to contract forecast and/or actual differences.