Note 10 - Investments in Affiliates - Summarized Balance Sheet Information for Equity Method Investments (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Current assets		$ 1,455,246	$ 1,376,941
Total assets		2,379,996	2,502,088
Current liabilities		943,256	842,056
Granite’s share of net assets		75,287	84,176
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Current assets		133,882	122,348
Noncurrent assets		164,620	165,331
Total assets		298,502	287,679
Current liabilities		52,583	48,322
Long-term liabilities (1)	[1]	66,108	61,078
Total liabilities		118,691	109,400
Net assets		179,811	178,279
Granite’s share of net assets		$ 75,287	$ 84,176

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