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Note 5 - Summary of Share-based Compensation Expense (Benefit) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 24, 2017	Jun. 30, 2018	Jun. 24, 2017
Share-based compensation expense	$ 579,000	$ 60,000	$ 1,965,000	$ 180,000
The above compensation is net of tax benefits	427,000	751,000	909,000	2,060,000
Employee Stock Option [Member]
Share-based compensation expense	473,000	(20,000)	1,559,000	(165,000)
Stock Purchase Plan [Member]
Share-based compensation expense	89,000	65,000	355,000	300,000
Director Stock Award [Member]
Share-based compensation expense	16,000	14,000	48,000	42,000
Restricted Stock [Member]
Share-based compensation expense	$ 1,000	$ 1,000	$ 3,000	$ 3,000

X

- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

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X

- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ 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=109197908&loc=d3e5070-113901

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