Condensed Consolidated Statements Of Changes In Shareholders' 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, 2019	27,056
Beginning balance at Aug. 31, 2019	$ 1,353	$ 215,964	$ 59,403	$ 269
Beginning balance, shares, Treasury at Aug. 31, 2019					(13,087)
Beginning balance, Treasury at Aug. 31, 2019					$ (194,975)
Issuance of common stock from treasury, shares					9
Issuance of common stock from treasury		131			$ 123
Purchase of treasury shares, shares
Purchase of treasury shares					$ (3)
Stock-based compensation		1,851
Cumulative translation adjustments				(37)
Net income (loss)			(544)
Ending balance, shares at Nov. 30, 2019	27,056
Ending balance at Nov. 30, 2019	$ 1,353	217,946	58,859	232
Ending balance, shares, Treasury at Nov. 30, 2019					(13,078)
Ending balance, Treasury at Nov. 30, 2019					$ (194,855)
Beginning balance, shares at Aug. 31, 2019	27,056
Beginning balance at Aug. 31, 2019	$ 1,353	215,964	59,403	269
Beginning balance, shares, Treasury at Aug. 31, 2019					(13,087)
Beginning balance, Treasury at Aug. 31, 2019					$ (194,975)
Cumulative translation adjustments						$ 53
Net income (loss)						553
Ending balance, shares at Feb. 29, 2020	27,056
Ending balance at Feb. 29, 2020	$ 1,353	216,045	59,956	322
Ending balance, shares, Treasury at Feb. 29, 2020					(13,209)
Ending balance, Treasury at Feb. 29, 2020					$ (204,761)
Beginning balance, shares at Nov. 30, 2019	27,056
Beginning balance at Nov. 30, 2019	$ 1,353	217,946	58,859	232
Beginning balance, shares, Treasury at Nov. 30, 2019					(13,078)
Beginning balance, Treasury at Nov. 30, 2019					$ (194,855)
Issuance of common stock from treasury, shares					241
Issuance of common stock from treasury		(3,361)			$ 3,591
Purchase of treasury shares, shares					(393)
Purchase of treasury shares					$ (13,830)
Stock-based compensation		1,793
Restricted stock award, shares					21
Restricted stock award		(333)			$ 333
Cumulative translation adjustments				90		90
Net income (loss)			1,097			1,097
Ending balance, shares at Feb. 29, 2020	27,056
Ending balance at Feb. 29, 2020	$ 1,353	216,045	59,956	322
Ending balance, shares, Treasury at Feb. 29, 2020					(13,209)
Ending balance, Treasury at Feb. 29, 2020					$ (204,761)
Beginning balance, shares at Aug. 31, 2020	27,056
Beginning balance at Aug. 31, 2020	$ 1,353	211,920	49,968	641		59,453
Beginning balance, shares, Treasury at Aug. 31, 2020					(13,175)
Beginning balance, Treasury at Aug. 31, 2020					$ (204,429)
Issuance of common stock from treasury, shares					236
Issuance of common stock from treasury		(3,411)			$ 3,668
Purchase of treasury shares, shares					(89)
Purchase of treasury shares					$ (1,530)
Stock-based compensation		1,158
Cumulative translation adjustments				307
Net income (loss)			(892)
Ending balance, shares at Nov. 30, 2020	27,056
Ending balance at Nov. 30, 2020	$ 1,353	209,667	49,076	948
Ending balance, shares, Treasury at Nov. 30, 2020					(13,028)
Ending balance, Treasury at Nov. 30, 2020					$ (202,291)
Beginning balance, shares at Aug. 31, 2020	27,056
Beginning balance at Aug. 31, 2020	$ 1,353	211,920	49,968	641		59,453
Beginning balance, shares, Treasury at Aug. 31, 2020					(13,175)
Beginning balance, Treasury at Aug. 31, 2020					$ (204,429)
Cumulative translation adjustments						274
Net income (loss)						(938)
Ending balance, shares at Feb. 28, 2021	27,056
Ending balance at Feb. 28, 2021	$ 1,353	208,816	49,030	915		59,040
Ending balance, shares, Treasury at Feb. 28, 2021					(12,915)
Ending balance, Treasury at Feb. 28, 2021					$ (201,074)
Beginning balance, shares at Nov. 30, 2020	27,056
Beginning balance at Nov. 30, 2020	$ 1,353	209,667	49,076	948
Beginning balance, shares, Treasury at Nov. 30, 2020					(13,028)
Beginning balance, Treasury at Nov. 30, 2020					$ (202,291)
Issuance of common stock from treasury, shares					143
Issuance of common stock from treasury		(2,014)			$ 2,222
Purchase of treasury shares, shares					(58)
Purchase of treasury shares					$ (1,441)
Stock-based compensation		1,599
Restricted stock award, shares					28
Restricted stock award		(436)			$ 436
Cumulative translation adjustments				(33)		(33)
Net income (loss)			(46)			(46)
Ending balance, shares at Feb. 28, 2021	27,056
Ending balance at Feb. 28, 2021	$ 1,353	$ 208,816	$ 49,030	$ 915		$ 59,040
Ending balance, shares, Treasury at Feb. 28, 2021					(12,915)
Ending balance, Treasury at Feb. 28, 2021					$ (201,074)