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Sales-Type Leases (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2012
May 31, 2012
Minimum lease payments receivable and the net investment    
Gross minimum lease payments receivable $ 11,175 $ 12,284
Less - unearned interest (530) (603)
Net investment in sales-type lease receivables $ 10,645 $ 11,681