Note 8 - Benefit Plans - Weighted Average Assumptions (Details)	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Foreign Plan [Member]
Expected return on plan assets	4.50%
Pension Plan [Member]
Discount rate	3.00%	3.70%
Expected return on plan assets	4.50%	4.90%
Compensation increase rate	4.50%	5.30%
Measurement dates	Dec. 31, 2016	Jan. 02, 2016
Discount rate	3.10%	2.60%	3.80%
Compensation increase rate	5.00%	4.50%	6.20%
Measurement dates	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Pension Plan [Member] | UNITED STATES
Discount rate			3.90%
Expected return on plan assets			6.80%
Measurement dates			Dec. 27, 2014
Pension Plan [Member] | Foreign Plan [Member]
Discount rate			3.70%
Expected return on plan assets			5.10%
Compensation increase rate			5.30%
Measurement dates			Dec. 27, 2014