Note 8 - Accounting for Share-based Compensation - Stock Option Activity (Details)	9 Months Ended
	Sep. 02, 2017 $ / shares shares
Outstanding Options (in shares) | shares	2,986,481
Outstanding Options (in dollars per share) | $ / shares	$ 34.92
Granted (in shares) | shares	721,904
Granted (in dollars per share) | $ / shares	$ 50.04
Exercised (in shares) | shares	(437,694)
Exercised (in dollars per share) | $ / shares	$ 37.39
Forfeited or cancelled (in shares) | shares	(89,589)
Forfeited or cancelled (in dollars per share) | $ / shares	$ 36.69
Outstanding Options (in shares) | shares	3,181,102
Outstanding Options (in dollars per share) | $ / shares	$ 38.39