Note 11 - Construction Joint Ventures - Schedule of Unconsolidated Construction Joint Ventures Revenue and Costs (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Cost of revenue		$ 689,806	$ 736,439	$ 1,187,617	$ 1,249,059
Net loss		16,568	55,747	6,747	(9,576)
Granite’s interest in net income (loss) (2)				(17,228)	6,972
Collaborative Arrangement [Member]
Revenue		23,190	86,901	72,845	166,623
Cost of revenue		36,265	80,453	89,534	159,789
Granite’s interest in gross profit (loss)		(13,075)	6,448	(16,689)	6,834
Granite’s interest in net income (loss) (2)	[1]	(13,601)	6,551	(17,228)	6,969
Collaborative Arrangement [Member] | Corporate Joint Venture [Member]
Revenue		91,564	263,558	252,703	495,600
Cost of revenue		93,162	249,494	251,083	497,564
Net loss		(2,871)	13,813	296	(2,190)
Collaborative Arrangement [Member] | Co-venturer [Member] | Other Partners Interest in Partnerships [Member]
Revenue	[2]	68,374	176,657	179,858	328,977
Cost of revenue	[2]	56,897	169,041	161,549	337,775
Net loss	[2]	$ 10,730	$ 7,262	$ 17,524	$ (9,159)

[1] These joint venture 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.