Note 13 - Shareholders' Equity (Tables)

12 Months Ended

Dec. 27, 2014

Stockholders' Equity Note [Abstract]

Schedule of 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 28, 2013		496,203		$	51.93
Granted		124,110			94.84
Exercised		(197,276	)		44.94
Forfeited		(1,175	)		31.83
Outstanding December 27, 2014		421,862			67.88	4.6	$	13,028
Exercisable December 27, 2014		170,132			49.96	3.0		8,302

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

	Shares			Weighted Average Grant-Date Fair Value
Nonvested December 28, 2013		184,573		$	63.56
Granted		99,880			92.96
Vested		(84,128	)		62.74
Forfeited		(11,327	)		72.75
Nonvested December 27, 2014		188,998			78.91

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

	2014			2013			2012
Weighted average fair value of options granted	$	26.25		$	23.90		$	23.38
Assumptions:
Risk-free interest rate		1.67	%		0.70	%		0.89	%
Expected dividend yield		0.93	%		1.20	%		1.14	%
Expected stock price volatility		33.0	%		45.0	%		46.0	%
Expected life of options (years)	4.6			5.1			5.1

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

	Pension liability adjustments (a)			Gain on investments (b)		Foreign currency translation adjustment			Accumulated other comprehensive income (loss)
Balance at December 29, 2012	$	(20,879	)	$	7,867	$	29,560		$	16,548
2013 activity		3,739			1,526		(1,396	)		3,869
Balance at December 28, 2013		(17,140	)		9,393		28,164			20,417
2014 activity		(12,475	)		1,398		(30,466	)		(41,543	)
Balance at December 27, 2014	$	(29,615	)	$	10,791	$	(2,302	)	$	(21,126	)