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Note 9. Investments - Supplemental Employee Retirement Plan Investments (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Jun. 30, 2013
Schedule of Trading Securities and Other Trading Assets    
SERP investment - current asset $ 7,744 $ 7,031
SERP investment - other long-term asset 12,678 12,569
Total SERP investment 20,422 19,600
SERP obligation - current liability 7,744 7,031
SERP obligation - other long-term liability 12,678 12,569
Total SERP obligation $ 20,422 $ 19,600