CONDENSED CONSOLIDATED STATEMENTS OF 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 at Aug. 31, 2020	$ 20	$ 157,850	$ 398,731	$ (28,208)	$ (368,080)	$ 160,313
Beginning balance, shares at Aug. 31, 2020	19,812,685				6,147,899
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes		(3,490)				(3,490)
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes, shares	23,417
Stock-based compensation		2,665				2,665
Cash dividends			(9,199)			(9,199)
Foreign currency translation adjustment				588		588
Net income			23,623			23,623
Ending balance at Nov. 30, 2020	$ 20	157,025	413,155	(27,620)	$ (368,080)	174,500
Ending balance, shares at Nov. 30, 2020	19,836,102				6,147,899
Beginning balance at Aug. 31, 2021	$ 20	163,737	430,735	(26,030)	$ (368,080)	$ 200,382
Beginning balance, shares at Aug. 31, 2021	19,856,865				6,147,899	13,708,966
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes		(4,246)				$ (4,246)
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes, shares	30,072
Stock-based compensation		2,891				2,891
Cash dividends			(9,905)			(9,905)
Acquisition of treasury stock					$ (7,386)	(7,386)
Acquisition of treasury stock, shares					32,000
Foreign currency translation adjustment				(1,893)		(1,893)
Net income			18,555			18,555
Ending balance at Nov. 30, 2021	$ 20	$ 162,382	$ 439,385	$ (27,923)	$ (375,466)	$ 198,398
Ending balance, shares at Nov. 30, 2021	19,886,937				6,179,899	13,707,038