Note 12 - Investments in Affiliates - Summarized Balance Sheet Information for Equity Method Investments (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021		Sep. 30, 2021
Current assets		$ 1,579,690	$ 1,827,399		$ 1,665,432
Total assets		2,407,964	2,494,927		2,561,756
Current liabilities		1,040,983	1,069,318		1,100,351
Granite’s share of net assets		78,663	23,368	[1]	72,415
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Current assets		183,637	34,374	[1]	162,503
Noncurrent assets		173,494	78,829	[1]	161,700
Total assets		357,131	113,203	[1]	324,203
Current liabilities		99,535	23,685	[1]	80,145
Long-term liabilities	[2]	61,140	48,104	[1]	59,501
Total liabilities		160,675	71,789	[1]	139,646
Net assets		$ 196,456	$ 41,414	[1]	$ 184,557

[1] These balances do not include amounts held for sale (see Note 3).

[2] This balance is primarily related to local bank debt for equipment purchases and debt associated with our real estate investments.