Note 10 - Accrued Expenses and Other Current Liabilities (Details) - Accrued Expenses and Other Current Liabilities (USD $) In Thousands, unless otherwise specified	May 31, 2014	May 31, 2013
Accrued Expenses and Other Current Liabilities [Abstract]
Salaries and wages	$ 11,410	$ 11,319
Sales and other taxes payable	4,880	5,080
Contingent consideration liability	11,300	4,504
Other accruals	3,381	3,411
Royalties	1,572	1,029
Pricing discount to dealers	197	363
Professional fees and dealer commission	1,389	948
Medical claims liability	887
Accrued expenses and other current liabilities	$ 23,716	$ 26,654