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General (Details) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2013
May 31, 2012
Unrealized loss on available for sale investments $ (8) $ (8)
Unrecognized loss on terminated interest rate swap agreement (7) (58)
Net unrecognized actuarial loss for pension obligation (4,073) (4,073)
Accumulated other comprehensive loss $ (4,088) $ (4,139)