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 (Loss) [Member]	Treasury Stock [Member]	Total
Beginning balance, shares at Aug. 31, 2021	27,056,000
Beginning balance at Aug. 31, 2021	$ 1,353	$ 214,888	$ 63,591	$ 709
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)		$ (144)
Net income			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
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, 2022	27,056,000
Beginning balance at Aug. 31, 2022	$ 1,353	220,246	82,021	(542)		$ 82,814
Beginning balance, shares, Treasury at Aug. 31, 2022					(13,203,000)
Beginning balance, Treasury at Aug. 31, 2022					$ (220,264)
Issuance of common stock from treasury, shares					56,000	56,045
Issuance of common stock from treasury		(568)			$ 935
Purchase of common shares for treasury, shares					(18,000)
Purchase of common shares for treasury					$ (835)
Stock-based compensation		2,735
Cumulative translation adjustments				(130)		$ (130)
Net income			4,667			4,667
Ending balance, shares at Nov. 30, 2022	27,056,000
Ending balance at Nov. 30, 2022	$ 1,353	$ 222,413	$ 86,688	$ (672)		$ 89,618
Ending balance, shares, Treasury at Nov. 30, 2022					(13,165,000)
Ending balance, Treasury at Nov. 30, 2022					$ (220,164)