Note 13 - Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
State net operating loss carryforwards	$ 26,015	$ 31,292
Alternative minimum tax and other tax credit carryforwards	12,325	31,993
Stock-based compensation expense	18,228	20,068
Warranty, litigation and other reserves	14,155	9,470
Receivables from related party	7,626	8,342
Accrued compensation	7,330	7,241
Asset impairment charges	6,456	5,049
Inventory, additional costs capitalized for tax purposes	6,498	5,894
Other, net	2,993	2,429
Total deferred tax assets	101,626	121,778
Valuation allowance	(13,803)	(12,868)
Total deferred tax assets, net of valuation allowance	87,823	108,910
Deferred tax liabilities:
Property, equipment and other assets	4,276	4,739
Deferred revenue	1,400	2,312
Unrealized gain on marketable securities	4,676	671
Other, net	2,583	2,081
Total deferred tax liabilities	12,935	9,803
Net deferred tax asset	$ 74,888	$ 99,107