Note 7 - Inventory Impairments (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015
West [Member]
Impairment Data; Inventory Impairments	$ 1,400			$ 1,400
Mountain [Member]
Impairment Data; Inventory Impairments
East [Member]
Impairment Data; Inventory Impairments	200			200	350
Impairment Data; Inventory Impairments	$ 1,600		$ 350	$ 1,600	$ 350