Note 7 - Inventories - Inventory Impairments (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Impairment Data; Inventory Impairments	$ 200	$ 550		$ 4,850	$ 750	$ 4,850
Homebuilding Segment [Member]
Impairment Data; Inventory Impairments	200				750	4,850
Homebuilding Segment [Member] | Housing Completed or Under Construction [Member]
Impairment Data; Inventory Impairments	200				750	4,850
Homebuilding Segment [Member] | Reportable Segment, West [Member] | Housing Completed or Under Construction [Member]
Impairment Data; Inventory Impairments					375	4,100
Homebuilding Segment [Member] | Reportable Segment, Mountain [Member] | Housing Completed or Under Construction [Member]
Impairment Data; Inventory Impairments					175
Homebuilding Segment [Member] | Reportable Segment, East [Member] | Housing Completed or Under Construction [Member]
Impairment Data; Inventory Impairments	$ 200				$ 200	$ 750