Condensed Consolidated Statements Of 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 treasury shares, shares					(89,000)
Purchase of treasury shares					$ (1,530)
Stock-based compensation		1,158
Cumulative translation adjustments				307		$ 307
Net income (loss)			(892)			(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, 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	216,752
Issuance of common stock from treasury		(3,033)			$ 3,378
Purchase of treasury shares, shares					(85,000)
Purchase of treasury shares					$ (3,488)
Stock-based compensation		1,649
Cumulative translation adjustments				(144)		$ (144)
Net income (loss)			3,812			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		$ 82,037
Ending balance, shares, Treasury at Nov. 30, 2021					(12,757,000)
Ending balance, Treasury at Nov. 30, 2021					$ (200,788)