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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, 2017	$ 20	$ 150,692	$ 315,764	$ (28,075)	$ (299,014)	$ 139,387
Beginning balance, shares at Aug. 31, 2017	19,688,238				5,704,055
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes		(1,548)				(1,548)
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes, shares	32,279
Stock-based compensation		1,777				1,777
Cash dividends			(6,888)			(6,888)
Acquisition of treasury stock					$ (3,893)	(3,893)
Acquisition of treasury stock, shares					35,250
Foreign currency translation adjustment				3,827		3,827
Net income			12,630			12,630
Ending balance at Nov. 30, 2017	$ 20	151,110	321,378	(24,248)	$ (302,907)	145,353
Ending balance, shares at Nov. 30, 2017	19,720,517				5,739,305
Cumulative effect of change in accounting principle		189	(128)			61
Beginning balance at Aug. 31, 2018	$ 20	153,469	351,266	(27,636)	$ (321,630)	$ 155,489
Beginning balance, shares at Aug. 31, 2018	19,729,774				5,879,361	13,850,413
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes		(2,425)				$ (2,425)
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes, shares	24,062
Stock-based compensation		1,965				1,965
Cash dividends			(7,522)			(7,522)
Acquisition of treasury stock					$ (6,863)	(6,863)
Acquisition of treasury stock, shares					41,184
Foreign currency translation adjustment				(1,631)		(1,631)
Net income			13,279			13,279
Ending balance at Nov. 30, 2018	$ 20	$ 153,009	356,699	$ (29,267)	$ (328,493)	$ 151,968
Ending balance, shares at Nov. 30, 2018	19,753,836				5,920,545	13,833,291
Cumulative effect of change in accounting principle			$ (324)			$ (324)

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