Note 13 - Reconciliation of Outstanding Stock Options (Details) $ in Thousands	12 Months Ended
	Jan. 02, 2016 USD ($) $ / shares shares
Outstanding (in shares) | shares	421,862
Outstanding (in dollars per share) | $ / shares	$ 67.88
Granted (in shares) | shares	145,140
Granted (in dollars per share) | $ / shares	$ 96.18
Exercised (in shares) | shares	(95,548)
Exercised (in dollars per share) | $ / shares	$ 48.74
Forfeited (in shares) | shares	(550)
Forfeited (in dollars per share) | $ / shares	$ 29.68
Outstanding (in shares) | shares	470,904
Outstanding (in dollars per share) | $ / shares	$ 80.53
Outstanding	4 years 292 days
Outstanding | $	$ 12,470
Exercisable (in shares) | shares	199,472
Exercisable (in dollars per share) | $ / shares	$ 66.23
Exercisable	3 years 219 days
Exercisable | $	$ 8,135