Note 7 - Segment Information - Long-lived Assets by Geographic Areas (Details) - USD ($) $ in Thousands		Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Long-lived Assets	[1]	$ 100,454	$ 84,622	$ 59,264
UNITED STATES
Long-lived Assets	[1]	79,299	70,646	49,923
UNITED KINGDOM
Long-lived Assets	[1]	6,012	5,772	3,655
All Other European Countries [Member]
Long-lived Assets	[1]	6,306	1,018	1,322
Asia Pacific [Member]
Long-lived Assets	[1]	$ 8,837	$ 7,186	$ 4,364

[1] Long-lived assets consist of property, equipment and leasehold improvements, net of accumulated depreciation and amortization and exclude goodwill, intangible assets, deferred taxes and other assets.