Condensed Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ 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, 2020	27,056,000
Beginning balance at Aug. 31, 2020	$ 1,353	$ 211,920	$ 49,968	$ 641
Beginning balance, shares, Treasury at Aug. 31, 2020					(13,175,000)
Beginning balance, Treasury at Aug. 31, 2020					$ (204,429)
Issuance of common stock from treasury, shares					236,000
Issuance of common stock from treasury		(3,411)			$ 3,668
Purchase of common shares for treasury, shares					(89,000)
Purchase of common shares for treasury					$ (1,530)
Stock-based compensation		1,158
Cumulative translation adjustments				307
Net income (loss)			(892)
Ending balance, shares at Nov. 30, 2020	27,056,000
Ending balance at Nov. 30, 2020	$ 1,353	209,667	49,076	948
Ending balance, shares, Treasury at Nov. 30, 2020					(13,028,000)
Ending balance, Treasury at Nov. 30, 2020					$ (202,291)
Beginning balance, shares at Aug. 31, 2020	27,056,000
Beginning balance at Aug. 31, 2020	$ 1,353	211,920	49,968	641
Beginning balance, shares, Treasury at Aug. 31, 2020					(13,175,000)
Beginning balance, Treasury at Aug. 31, 2020					$ (204,429)
Cumulative translation adjustments						$ 274
Net income (loss)						(938)
Ending balance, shares at Feb. 28, 2021	27,056,000
Ending balance at Feb. 28, 2021	$ 1,353	208,816	49,030	915
Ending balance, shares, Treasury at Feb. 28, 2021					(12,915,000)
Ending balance, Treasury at Feb. 28, 2021					$ (201,074)
Beginning balance, shares at Nov. 30, 2020	27,056,000
Beginning balance at Nov. 30, 2020	$ 1,353	209,667	49,076	948
Beginning balance, shares, Treasury at Nov. 30, 2020					(13,028,000)
Beginning balance, Treasury at Nov. 30, 2020					$ (202,291)
Issuance of common stock from treasury, shares					143,000
Issuance of common stock from treasury		(2,014)			$ 2,222
Purchase of common shares for treasury, shares					(58,000)
Purchase of common shares for treasury					$ (1,441)
Restricted stock award, shares					28,000
Restricted stock award		(436)			$ 436
Stock-based compensation		1,599
Cumulative translation adjustments				(33)		(33)
Net income (loss)			(46)			(46)
Ending balance, shares at Feb. 28, 2021	27,056,000
Ending balance at Feb. 28, 2021	$ 1,353	208,816	49,030	915
Ending balance, shares, Treasury at Feb. 28, 2021					(12,915,000)
Ending balance, Treasury at Feb. 28, 2021					$ (201,074)
Beginning balance, shares at Aug. 31, 2021	27,056,000
Beginning balance at Aug. 31, 2021	$ 1,353	214,888	63,591	709		79,863
Beginning balance, shares, Treasury at Aug. 31, 2021					(12,889,000)
Beginning balance, Treasury at Aug. 31, 2021					$ (200,678)
Issuance of common stock from treasury, shares					217,000
Issuance of common stock from treasury		(3,033)			$ 3,378
Purchase of common shares for treasury, shares					(85,000)
Purchase of common shares for treasury					$ (3,488)
Stock-based compensation		1,649
Cumulative translation adjustments				(144)
Net income (loss)			3,812
Ending balance, shares at Nov. 30, 2021	27,056,000
Ending balance at Nov. 30, 2021	$ 1,353	213,504	67,403	565
Ending balance, shares, Treasury at Nov. 30, 2021					(12,757,000)
Ending balance, Treasury at Nov. 30, 2021					$ (200,788)
Beginning balance, shares at Aug. 31, 2021	27,056,000
Beginning balance at Aug. 31, 2021	$ 1,353	214,888	63,591	709		$ 79,863
Beginning balance, shares, Treasury at Aug. 31, 2021					(12,889,000)
Beginning balance, Treasury at Aug. 31, 2021					$ (200,678)
Issuance of common stock from treasury, shares						245,157
Cumulative translation adjustments						$ (176)
Net income (loss)						5,690
Ending balance, shares at Feb. 28, 2022	27,056,000
Ending balance at Feb. 28, 2022	$ 1,353	215,348	69,281	533		86,128
Ending balance, shares, Treasury at Feb. 28, 2022					(12,730,000)
Ending balance, Treasury at Feb. 28, 2022					$ (200,387)
Beginning balance, shares at Nov. 30, 2021	27,056,000
Beginning balance at Nov. 30, 2021	$ 1,353	213,504	67,403	565
Beginning balance, shares, Treasury at Nov. 30, 2021					(12,757,000)
Beginning balance, Treasury at Nov. 30, 2021					$ (200,788)
Issuance of common stock from treasury, shares					15,000
Issuance of common stock from treasury		$ 84			$ 239
Purchase of common shares for treasury, shares					(1,000)
Purchase of common shares for treasury					$ (47)
Restricted stock award, shares					13,000
Restricted stock award		$ (209)			$ 209
Stock-based compensation		1,969
Cumulative translation adjustments				(32)		(32)
Net income (loss)			1,878			1,878
Ending balance, shares at Feb. 28, 2022	27,056,000
Ending balance at Feb. 28, 2022	$ 1,353	$ 215,348	$ 69,281	$ 533		$ 86,128
Ending balance, shares, Treasury at Feb. 28, 2022					(12,730,000)
Ending balance, Treasury at Feb. 28, 2022					$ (200,387)