Note 15 - Employee Benefit Plans - Net Periodic Benefit Cost (Details) - Foreign Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Components of net periodic benefit cost
Service cost	$ 1,628	$ 1,032	$ 1,061
Interest cost	5,559	6,580	8,384
Expected return on plan assets	(6,496)	(7,553)	(8,764)
Amortizations	(34)	33	33
Recognized net actuarial (gains)/losses	1,287	1,076	1,359
Net periodic benefit cost	$ 1,944	$ 1,168	$ 2,073