Note 4 - Disaggregation of Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue	$ 3,010,053	$ 3,128,879	$ 2,914,877
CALIFORNIA
Revenue	1,065,000	1,150,214	985,724
Central [Member]
Revenue	1,091,718	1,170,906	1,080,215
Mountain [Member]
Revenue	853,335	807,759	848,938
Constructions [Member]
Revenue	2,602,306	2,764,094	2,575,791
Constructions [Member] | CALIFORNIA
Revenue	822,448	928,193	787,259
Constructions [Member] | Central [Member]
Revenue	1,058,448	1,145,725	1,056,385
Constructions [Member] | Mountain [Member]
Revenue	721,410	690,176	732,147
Materials [Member]
Revenue	407,747	364,785	339,086
Materials [Member] | CALIFORNIA
Revenue	242,552	222,021	198,465
Materials [Member] | Central [Member]
Revenue	33,270	25,181	23,830
Materials [Member] | Mountain [Member]
Revenue	$ 131,925	$ 117,583	$ 116,791