Note 7. Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Tax Benefit from Stock Options Exercised (in Dollars)	$ 1.0
Expiring 2012-2030 [Member]
Operating Loss Carryforwards (in Dollars)	$ 44
Foreign Tax Information [Member]
Other Information Pertaining to Income Taxes	one
Minimum State Tax Statute of Limitations [Member]
Other Information Pertaining to Income Taxes	four
Maximum State Tax Statute of Limitations [Member]
Other Information Pertaining to Income Taxes	six
Maximum [Member]
Other Information Pertaining to Income Taxes	ten