Condensed Consolidated Statements Of Changes In Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Total
Beginning balance, shares at Aug. 31, 2018	27,056				(13,159)
Beginning balance at Aug. 31, 2018	$ 1,353	$ 211,280	$ 63,569	$ 341	$ (196,043)
Issuance of common stock from treasury, shares					11
Issuance of common stock from treasury		64			$ 166
Purchase of treasury shares					$ (7)
Stock-based compensation		946
Cumulative translation adjustments				(309)		$ (309)
Net loss			(1,357)			(1,357)
Ending balance, shares at Nov. 30, 2018	27,056				(13,148)
Ending balance at Nov. 30, 2018	$ 1,353	212,290	59,069	32	$ (195,884)
Cumulative effect of accounting change			(3,143)
Beginning balance, shares at Aug. 31, 2019	27,056				(13,087)
Beginning balance at Aug. 31, 2019	$ 1,353	215,964	59,403	269	$ (194,975)	82,014
Issuance of common stock from treasury, shares					9
Issuance of common stock from treasury		131			$ 123
Purchase of treasury shares					$ (3)
Stock-based compensation		1,851
Cumulative translation adjustments				(37)		(37)
Net loss			(544)			(544)
Ending balance, shares at Nov. 30, 2019	27,056				(13,078)
Ending balance at Nov. 30, 2019	$ 1,353	$ 217,946	$ 58,859	$ 232	$ (194,855)	$ 83,535