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Note 7 - Stock-based Compensation (Details Textual) - USD ($)		3 Months Ended		9 Months Ended
	Feb. 28, 2020	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 15.45	$ 12.33
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period				3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period				10 years
Share-Based Payment Arrangement, Expense		$ 115,000	$ 89,000	$ 594,000	$ 489,000
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		530,000		$ 530,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				1 year 11 months 1 day
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Expense		178,000	$ 151,000	$ 801,000	$ 685,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				1 year 5 months 23 days
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount		$ 965,000		$ 965,000
Restricted Stock Units (RSUs) [Member] | Director [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period				1 year
Restricted Stock Units (RSUs) [Member] | Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period				3 years
The 2015 Equity Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized	750,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant		620,000		620,000

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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+ References

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+ References

No definition available.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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