Note 5. Income Taxes (Detail) - Changes in the Valuation Allowance (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended			12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2008	Dec. 31, 2011 Increase Due To Uncertainty Of Recovery [Member]	Dec. 31, 2010 Increase Due To Uncertainty Of Recovery [Member]	Dec. 31, 2010 Decrease Related To Net Recognition Of Deferred Tax Assets [Member]	Dec. 31, 2009 Decrease Related To Net Recognition Of Deferred Tax Assets [Member]	Dec. 31, 2009 Decrease Related To Utilization And Expiration [Member]
Balance at beginning of year		$ (19,073)	$ (104,429)	$ (138,848)
Valuation Allowance, Deferred Tax Asset, Change In Amount	(88,000)	(71,000)	(77,000)		(3,822)	(2,713)	88,069	7,100	27,319
Balance at end of year	(19,073)	(22,895)	(19,073)	(138,848)
Valuation Allowance, Deferred Tax Asset, Change In Amount	$ (88,000)	$ (71,000)	$ (77,000)		$ (3,822)	$ (2,713)	$ 88,069	$ 7,100	$ 27,319