Note 13 - Income (Loss) Per Share - Calculation of Income (Loss) Per Shares (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended													12 Months Ended
	Dec. 30, 2018	[1]	Sep. 30, 2018	[2]	Jul. 01, 2018	[3]	Apr. 01, 2018	Dec. 31, 2017	[4]	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	[5]	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Net income	$ 6,395		$ 8,172		$ 20,602		$ 15,084	$ 4,322		$ 19,439	$ 20,938	$ 8,547		$ 50,253	$ 53,246	$ 54,162
Weighted Average Shares Outstanding (in shares)														58,995	61,528	64,593
Participating Securities (in shares)														549	468	505
Shares for Basic Earnings Per Share (in shares)														59,544	61,996	65,098
Dilutive Effect of Stock Options (in shares)														22	44	38
Shares for Diluted Earnings Per Share (in shares)														59,566	62,040	65,136
Participating Securities [Member]
Net income														$ 500	$ 400	$ 400

[1] Results for the fourth quarter of 2018 include tax benefit of $6.7 million as a result of the finalization of the Company's analysis of the U.S. Tax Cuts and Jobs Act, as well as restructuring and asset impairment charges of $20.5 million. Results for the fourth quarter of 2018 include purchase price accounting amortization of $11.8 million and transaction related expense of $1.2 million.

[2] Results for the third quarter of 2018 include purchase price accounting amortization of $20.3 million and transaction related expenses of $2.4 million.

[3] Results for the second quarter of 2018 include transaction related expenses of $5.8 million.

[4] Results for the fourth quarter of 2017 include tax charges of $15.2 million as a result of the U.S. Tax Cuts and Jobs Act.

[5] Results for the first quarter of 2017 include restructuring and asset impairment charges of $7.3 million.