Note 9 - Shareholders' Equity (Tables)

12 Months Ended

Dec. 30, 2017

Notes Tables

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

	Shares Under Option			Weighted Average Price		Weighted Average Remaining Contract Life (Years)		Aggregate Intrinsic Value (000 ’s)
Outstanding December 31, 2016		356,184		$	98.65
Granted		76,082			154.15
Exercised		(27,965	)		84.93
Forfeited		—		NA
Outstanding December 3 0, 2017		404,301			110.04		4.5	$	35,488
Exercisable December 3 0, 2017		203,745			92.36		3.6		21,486

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

	Shares			Weighted Average Grant-Date Fair Value
Nonvested December 31, 2016		207,330		$	106.92
Granted		95,621			151.91
Vested		(95,520	)		102.49
Forfeited		(7,738	)		111.56
Nonvested December 3 0, 2017		199,693			130.40

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

	2017		201 6		201 5
Weighted average fair value of options granted		$30.77		$26.06		$21.99
Assumptions:
Risk-free interest rate		1.79%		1.37%		1.25%
Expected dividend yield		0.86%		0.97%		1.04%
Expected stock price volatility		23.0%		26.0%		28.0%
Expected life of options (years)		4.4		4.6		4.6

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

(in thousands )	Pension and postretirement liability and reclassification adjustments (a)			Gain (Loss) on investments			Foreign currency translation adjustment s			Accumulated other comprehensive income (loss)
Balance at December 27, 2014	$	(29,615	)	$	10,791		$	(2,302	)	$	(21,126	)
201 5 activity		20,893			793			(46,231	)		(24,545	)
Balance at January 2, 2016		(8,722	)		11,584			(48,533	)		(45,671	)
201 6 activity		(3,261	)		(815	)		(24,832	)		(28,908	)
Balance at December 31, 2016		(11,983	)		10,769			(73,365	)		(74,579	)
2017 activity		1,147			(974	)		10,738			10,911
Balance at December 30, 2017	$	(10,836	)	$	9,795		$	(62,627	)	$	(63,668	)