Note 7 - Segment Information - Long-lived Assets by Geographic Areas (Details) - USD ($) $ in Thousands		Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Long-lived Assets(1)
Long-lived Assets	[1]	$ 100,545	$ 100,454	$ 84,622
UNITED STATES
Long-lived Assets(1)
Long-lived Assets	[1]	74,792	79,299	70,646
UNITED KINGDOM
Long-lived Assets(1)
Long-lived Assets	[1]	5,806	6,012	5,772
All Other European Countries [Member]
Long-lived Assets(1)
Long-lived Assets	[1]	5,774	6,306	1,018
Asia Pacific [Member]
Long-lived Assets(1)
Long-lived Assets	[1]	$ 14,173	$ 8,837	$ 7,186

[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.