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Note 6 - Stock-based Compensation (Tables)

6 Months Ended

Mar. 31, 2018

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		Six Months Ended
		March 31,				April 1,
		2018				2017
Risk-free interest rate			2.72	%			2.03	%
Dividend yield			0.40	%			0.33	%
Expected volatility			37.74	%			38.79	%
Expected term (in years)			4.89				5.12

Share-based Compensation, Stock Options, Activity [Table Text Block]

															Contractual				Aggregate
		Options				Exercise Price Per Share									Term - Weighted				Intrinsic
		Outstanding									Weighted				Average				Value
		(in thousands)				Range					Average				(in years)				(in thousands)
Outstanding at September 30, 2017			392			$9.16	-	$37.06			$	23.40
Granted			44			29.69	-	29.69				29.69
Exercised			(7	)		18.05	-	23.95				21.00
Forfeited			(9	)		23.95	-	37.06				29.88
Outstanding at March 31, 2018			420			9.16	-	37.06				23.97				7.39			$	2,229
Vested and anticipated to vest in the future at March 31, 2018			418									23.94				7.38				2,223
Exercisable at March 31, 2018			236									20.46				6.22				1,894

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

						Weighted
		Restricted				Average
		Stock Units				Grant Date
(Unit amounts in thousands)		Outstanding				Fair Value
Balance, September 30, 2017			128			$	25.92
Granted			24				29.69
Released			(26	)			25.04
Forfeited			(4	)			29.60
Balance, March 31, 2018			122				26.74

Restricted Stock Units (RSUs) [Member]

Notes Tables

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

		Three Months Ended								Six Months Ended
		March 31,				April 1,				March 31,				April 1,
(In thousands)		2018				2017				2018				2017
Restricted stock unit grants:
Units			24				19				24				19
Market value		$	712			$	690			$	712			$	690
Compensation expense			457				465				602				626

Employee Stock Option [Member]

Notes Tables

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

		Three Months Ended								Six Months Ended
		March 31,				April 1,				March 31,				April 1,
(In thousands)		2018				2017				2018				2017
Compensation expense		$	381			$	411			$	471			$	507

X

- Definition

Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

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