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Note 8 - Stockholders' Equity (Details Textual) - $ / shares					3 Months Ended
	Oct. 24, 2018	Sep. 01, 2018	Nov. 20, 2017	Sep. 01, 2017	Nov. 30, 2018	Nov. 30, 2017	Aug. 31, 2018	Jan. 16, 2018	Jan. 12, 2018
Common Stock, Dividends, Per Share, Declared	$ 0.12		$ 0.10		$ 0.12	$ 0.10
Stock Repurchased and Retired During Period, Shares					0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross					70,884	47,252
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					0	1,500
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price						$ 10.25
Stock Issued During Period, Shares, Employee Stock Purchase Plans		874		891
Common Stock, Shares Authorized					15,000,000		15,000,000	15,000,000	10,000,000
Common Stock, Additional Shares Authorized					5,000,000
Dividends Payable, Date to be Paid	Nov. 21, 2018		Dec. 21, 2018
Dividends Payable, Date of Record	Nov. 07, 2018		Dec. 08, 2018
The 2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross					70,884	47,252
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price					$ 36.45	$ 18.35

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