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Note 5 - Summary of Share-based Compensation Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Share-based compensation expense	$ 580	$ 514	$ 1,404	$ 1,681
The above compensation is net of tax benefits	446	620	866	751
Share-based Payment Arrangement, Option [Member]
Share-based compensation expense	447	412	993	1,377
Stock Purchase Plan [Member]
Share-based compensation expense	64	69	342	271
Stock Issued to Outside Directors [Member]
Share-based compensation expense	22	33	22	33
Restricted Stock [Member]
Share-based compensation expense	$ 47	$ 0	$ 47	$ 0

X

- Definition

Amount, after tax, of expense for award under share-based payment arrangement.

+ References

No definition available.

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X

- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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