Note 5 - Stock-based Compensation (Details) (USD $)	12 Months Ended
	Aug. 31, 2014	Aug. 25, 2013	Aug. 26, 2012	Aug. 27, 2011
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 3.20	$ 3.83	$ 2.86
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 58,087	$ 183,075	$ 111,922
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	698,985
Proceeds from Stock Options Exercised	13,840	21,560	0
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options		26,063	32,384
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 4.97	$ 4.64	$ 4.24
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 292 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	228,747	199,080	212,496
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	601,419	310,786	629,192
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	6 years 36 days	5 years 328 days	6 years 146 days
Exercise Price Range 1 [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	15,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 2.13
Exercise Price Range 2 [Member] | Minimum [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 3.00
Exercise Price Range 2 [Member] | Maximum [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 3.47
Exercise Price Range 2 [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	47,500
Exercise Price Range 3 [Member] | Minimum [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 4.93
Exercise Price Range 3 [Member] | Maximum [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 7.45
Exercise Price Range 3 [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	240,751
2005 Stock Option Plan [Member] | Minimum [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	6 months
2005 Stock Option Plan [Member] | Maximum [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
2005 Stock Option Plan [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	600,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	26,915	64,500	27,666
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	303,251	259,916	264,500	248,166
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 5.30	$ 4.97	$ 4.44	$ 4.16
Employee Stock Option [Member] | 2005 Stock Option Plan [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Shares Paid for Tax Withholding for Share Based Compensation	18,539	45,628	17,265
Employee Stock Option [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	207,227
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year
Nonvested [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	74,504
Restricted Stock [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 7,885
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Intrinsic Value, Amount Per Share	$ 58,779
Minimum [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	5 years	5 years	5 years
Maximum [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	10 years	10 years	10 years
2005 Stock Option Plan [Member]
Note 5 - Stock-based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	26,915	64,500	27,666