Note 3 - Segment Reporting - Reconciliation of Revenue From Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Homebuilding Segment [Member]
Revenues	$ 749,608	$ 648,971	$ 1,357,296	$ 1,212,697
Homebuilding Segment [Member] | Reportable Segment, West [Member]
Revenues	391,806	323,758	711,315	632,837
Homebuilding Segment [Member] | Reportable Segment, Mountain [Member]
Revenues	268,541	224,356	477,173	397,492
Homebuilding Segment [Member] | Reportable Segment, East [Member]
Revenues	89,261	100,857	168,808	182,368
Financial Services Segment [Member]
Revenues	21,372	19,073	40,407	37,052
Financial Services Segment [Member] | Mortgage Operations [Member]
Revenues	14,547	12,697	27,243	24,880
Financial Services Segment [Member] | Other Financial Services [Member]
Revenues	$ 6,825	$ 6,376	$ 13,164	$ 12,172