Note 9. Shareholders' Equity (Detail) - Stock Option Transactions (USD $)	12 Months Ended
	Dec. 31, 2011
Outstanding, December 31, 2010 (in Shares)	1,269,668
Outstanding, December 31, 2010	$ 6.68
Outstanding, December 31, 2011 (in Shares)	1,194,796
Outstanding, December 31, 2011	$ 6.72
Exercised (in Shares)	(74,872)
Exercised	$ 6.40