Note 7 - Inventories - Inventory Impairments (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Impairment Data; Inventory Impairments	$ 0	$ 610	$ 200	$ 550	$ 610	$ 750
Homebuilding Segment [Member]
Impairment Data; Inventory Impairments	(0)		200		610	750
Homebuilding Segment [Member] | Reportable Segment, West [Member] | Housing Completed or Under Construction [Member]
Impairment Data; Inventory Impairments	0		0		0	375
Homebuilding Segment [Member] | Reportable Segment, Mountain [Member] | Housing Completed or Under Construction [Member]
Impairment Data; Inventory Impairments	0		0		400	175
Homebuilding Segment [Member] | Reportable Segment, East [Member] | Housing Completed or Under Construction [Member]
Impairment Data; Inventory Impairments	$ 0		$ 200		$ 210	$ 200