Note 13 - Changes in Deferred Financing Costs (Details) - USD ($) $ in Thousands		12 Months Ended
		May 31, 2016	May 31, 2015
Balance at beginning of period		$ 26,399	$ 33,116
Debt issuance costs (1)	[1]	118
Amortization		(7,120)	(6,717)
Balance at end of period		$ 19,397	$ 26,399

[1] Debt issuance costs are related to Amendment No. 6 of our credit agreement