Note 5. Benefit Plans (Detail) - Net Periodic Benefit Cost (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Service cost	$ 146	$ 130
Interest cost	90	88
Expected return on plan assets	(100)	(87)
Amortization loss	66	41
Amortization of prior service cost	(2)	(2)
	$ 200	$ 170