Note 9 - Long-term Debt - Changes in Deferred Financing Costs (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Nov. 30, 2016	May 31, 2016
Balance at beginning of period		$ 19,397	$ 26,399
Debt issuance costs (1)	[1]	5	118
Amortization		(3,514)	(7,120)
Balance at end of period		$ 15,888	$ 19,397

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