Note 10 - Investments in Affiliates - Summarized Balance Sheet Information for Equity Method Investments (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Current assets		$ 1,827,399	$ 1,455,246
Total assets		2,494,927	2,379,996
Current liabilities		1,069,318	943,256
Granite’s share of net assets		23,368	27,637
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Current assets		34,374	28,367
Noncurrent assets		78,829	72,005
Total assets		113,203	100,372
Current liabilities		23,685	12,517
Long-term liabilities	[1]	48,104	35,786
Total liabilities		71,789	48,303
Net assets		41,414	52,069
Granite’s share of net assets		$ 23,368	$ 27,637

[1] The balance primarily related to local bank debt for equipment purchases and working capital in our foreign affiliates, as well as debt associated with our real estate investments.