Note 5 - Disaggregation of Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue	$ 768,286	$ 834,671	$ 1,315,872	$ 1,401,003
CALIFORNIA
Revenue	270,929	299,121	461,003	500,343
Central [Member]
Revenue	221,307	298,714	455,762	560,387
Mountain [Member]
Revenue	276,050	236,836	399,107	340,273
Constructions [Member]
Revenue	632,260	713,425	1,107,195	1,220,396
Constructions [Member] | CALIFORNIA
Revenue	199,357	228,631	343,744	387,897
Constructions [Member] | Central [Member]
Revenue	207,406	287,994	431,499	541,287
Constructions [Member] | Mountain [Member]
Revenue	225,497	196,800	331,952	291,212
Materials [Member]
Revenue	136,026	121,246	208,677	180,607
Materials [Member] | CALIFORNIA
Revenue	71,572	70,490	117,259	112,446
Materials [Member] | Central [Member]
Revenue	13,901	10,720	24,263	19,100
Materials [Member] | Mountain [Member]
Revenue	$ 50,553	$ 40,036	$ 67,155	$ 49,061