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Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified | May 31, 2014 | May 31, 2013
--- | --- | ---
Accrued liabilities |  |
Payroll and related expenses | $ 8,224 | $ 6,491
Royalties | 2,620 | 2,034
Accrued severance | 765 | 1,602
Deferred revenue | 200 | 1,573
Sales and franchise taxes | 1,327 | 1,047
Interest rate swap liability | 555 | 523
Other | 3,071 | 3,156
Total | $ 16,762 | $ 16,426

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