Consolidated Condensed Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2016	Aug. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Income (loss)	$ 1,300	$ (775)
Other comprehensive income (loss), before tax:
Unrealized gain on interest rate swap	0	66
Unrealized gain (loss) on marketable securities	(6)	3
Foreign currency translation (loss)	(294)	(90)
Other comprehensive (loss), before tax	(300)	(21)
Income tax (expense) benefit related to items of other comprehensive income	2	(26)
Other comprehensive (loss), net of tax	(298)	(47)
Total comprehensive income (loss), net of tax	$ 1,002	$ (822)