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Note 8 - Stockholders' Equity (Details Textual) - USD ($)	8 Months Ended	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2018	Aug. 31, 2017	Jan. 15, 2018
Stock Repurchase Program, Authorized Amount	$ 3,000,000	$ 3,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 2,640,548	$ 2,640,548
Stock Repurchased and Retired During Period, Shares		0	14,525
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Including Cashless Exercises		6,407
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		4,410	12,000
Treasury Stock Acquired, Average Cost Per Share			$ 13.51
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price		$ 11.59	$ 10.25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		47,252	56,677
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price		$ 18.35	$ 13.40
Common Stock, Shares Authorized	15,000,000	15,000,000	10,000,000	10,000,000
Common Stock, Additional Shares Authorized	5,000,000
The 2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			56,677
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price			$ 13.40

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