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Investments: Available-for-sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Balance, beginning of period $ (183) $ (178)
Realized loss from securities included in beginning balance      
Gross unrealized holding gains (losses), in equity securities (8) (5)
Deferred income taxes on unrealized holding loss 3 2
Balance, end of period $ (188) $ (181)