Note 5: Benefit Plans (Detail) - Stock Option Activity (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012 Incentive Stock Options [Member]	Jun. 30, 2012 Non-Incentive Stock Options [Member]	Dec. 31, 2011 Non-Incentive Stock Options [Member]
Balance outstanding as of January 1, 2012		184,500	167,000	167,000
Balance outstanding as of January 1, 2012 (in Dollars per share)	$ 16.09
Balance outstanding as of June 30, 2012		174,500	167,000	167,000
Balance outstanding as of June 30, 2012 (in Dollars per share)	$ 16.38
Options exercisable as of June 30, 2012		128,800	124,750
Options exercisable as of June 30, 2012 (in Dollars per share)	$ 19.34
Exercised		(2,003)
Exercised (in Dollars per share)	$ 6.19
Forfeited		(7,997)
Forfeited (in Dollars per share)	$ 6.19