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Note 2. Long-Term Incentive Plans (Detail) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 0.7   0.7  
Share-based Compensation Arrangement by Share-based Payment Award Option Life     10 years  
Share-based Compensation (in Dollars) $ 175,000 $ 277,000 $ 479,000 $ 518,000
Time-based Awards [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
Options that Will Vest Upon Achievement of Financial Conditions in 2013 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)     1  
Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
The 2008 Long-Term Incentive Plan [Member]
       
Share-based Compensation (in Dollars)     0  
The 2012 Incentive Plan [Member]
       
Share-based Compensation (in Dollars)     $ 0