Note 5. Benefit Plans (Detail) - Net Periodic Benefit Cost (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Service cost	$ 130	$ 108	$ 390	$ 300
Interest cost	88	86	264	248
Expected return on plan assets	(87)	(80)	(261)	(220)
Actuarial loss (gain)	41	(7)	123	(19)
Amortization of prior service cost	(2)	20	(6)	30
	$ 170	$ 127	$ 510	$ 339