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Note 5 - Summary of Share-based Compensation Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 25, 2017	Mar. 31, 2018	Mar. 25, 2017
Share-based compensation expense	$ 570	$ 156	$ 1,386	$ 120
The above compensation is net of tax benefits	344	526	482	1,309
Employee Stock Option [Member]
Share-based compensation expense	471	66	1,086	(145)
Stock Purchase Plan [Member]
Share-based compensation expense	66	61	266	235
Director Stock Award [Member]
Share-based compensation expense	32	28	32	28
Restricted Stock [Member]
Share-based compensation expense	$ 1	$ 1	$ 2	$ 2

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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