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Note 16 - Enterprise-wide Disclosures - Revenue and Long-lived Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Oct. 01, 2017
Jul. 02, 2017
Apr. 02, 2017
 [2]
Jan. 01, 2017
Oct. 02, 2016
Jul. 03, 2016
Apr. 03, 2016
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Net sales $ 266,210 [1] $ 257,431 $ 251,700 $ 221,102 $ 239,507 [3] $ 248,349 $ 248,207 $ 222,554 $ 996,443 [4] $ 958,617 [4] $ 1,001,863 [4]
Long-lived assets [5] 212,645       204,508       212,645 204,508
UNITED STATES                      
Net sales [4]                 514,783 501,206 520,375
Long-lived assets [5] 76,557       79,365       76,557 79,365
UNITED KINGDOM                      
Net sales [4]                 57,391 58,266 72,445
Long-lived assets [5] 7,902       8,122       7,902 8,122
AUSTRALIA                      
Net sales [4]                 87,591 78,141 76,600
Long-lived assets [5] 45,067       44,209       45,067 44,209
Other Foreign Countries [Member]                      
Net sales [4]                 336,678 321,004 332,443
Long-lived assets [5] 3,083       2,585       3,083 2,585
NETHERLANDS                      
Long-lived assets [5] 55,132       43,907       55,132 43,907
THAILAND                      
Long-lived assets 16,543       16,645       16,543 16,645
CHINA                      
Long-lived assets [5] $ 8,361       $ 9,675       $ 8,361 $ 9,675
[1] Results for the fourth quarter of 2017 include tax charges of $15.2 million as a result of the recently enacted U.S. Tax Cuts and Jobs Act.
[2] Results for the first quarter of 2017 include restructuring and asset impairment charges of $7.3 million.
[3] Results for the fourth quarter of 2016 include restructuring and asset impairment charges of $19.8 million.
[4] Revenue attributed to geographic areas is based on the location of the customer.
[5] Long-lived assets include tangible assets physically located in foreign countries.