Note 5 - Disaggregation of Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue	$ 547,586	$ 566,332
CALIFORNIA
Revenue	190,074	201,222
Central [Member]
Revenue	234,455	261,673
Mountain [Member]
Revenue	123,057	103,437
Constructions [Member]
Revenue	474,935	506,971
Constructions [Member] | CALIFORNIA
Revenue	144,387	159,266
Constructions [Member] | Central [Member]
Revenue	224,093	253,293
Constructions [Member] | Mountain [Member]
Revenue	106,455	94,412
Materials [Member]
Revenue	72,651	59,361
Materials [Member] | CALIFORNIA
Revenue	45,687	41,956
Materials [Member] | Central [Member]
Revenue	10,362	8,380
Materials [Member] | Mountain [Member]
Revenue	$ 16,602	$ 9,025