Note 6. Fair Value Measurement (Detail) - Level 3 Asset Quantitative Information (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Selling Cost [Member] Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2012 Discount for Lack of Marketability [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value	$ 5,505	$ 4,084	$ 1,068
Valuation Technique			Discounted appraised value
Unobservable Input			Selling cost	Discount for lack of marketability and age of appraisal