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Segment and Geographic Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 29, 2018
 [1]
Jun. 30, 2018
 [1]
Mar. 31, 2018
 [1]
Dec. 31, 2017
Sep. 30, 2017
 [1]
Jul. 01, 2017
 [1]
Apr. 01, 2017
 [1]
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Net revenues $ 76,982 [1] $ 75,490 $ 74,231 $ 73,091 $ 69,439 [1] $ 62,805 $ 62,319 $ 59,787 $ 299,794 $ 254,350 $ 224,929
Gross profit 30,816 [1] 30,580 31,366 28,505 26,740 [1] 24,267 24,759 22,517 121,267 98,283 82,809
Segment operating income (loss) 7,091 [1] 10,631 11,315 8,186 7,160 [1] 5,530 5,853 3,945 37,223 22,488 11,267
Acquisition costs                 0 0 494
Impairment of goodwill and indefinite-lived intangibles 2,820 [1] 0 0 0 0 [1] 0 0 0 2,820 0 0
Restructuring costs 0 [1] $ 228 $ 61 $ 0 752 [1] $ 423 $ 315 $ 554 289 2,044 2,666
Depreciation and amortization expense                 10,631 10,626 11,149
Capital expenditures                 13,239 10,092 10,425
Total assets 326,383       306,551       326,383 306,551 270,510
Foil Technology Products                      
Segment Reporting Information [Line Items]                      
Gross profit                 61,562 47,755 39,368
Segment operating income (loss)                 38,404 26,426 20,391
Acquisition costs                     427
Impairment of goodwill and indefinite-lived intangibles                 2,820    
Restructuring costs                 0 85 1,137
Depreciation and amortization expense                 5,173 4,946 4,894
Capital expenditures                 9,239 4,519 6,516
Total assets 132,918       119,175       132,918 119,175 99,411
Force Sensors                      
Segment Reporting Information [Line Items]                      
Gross profit                 20,001 18,192 15,632
Segment operating income (loss)                 10,514 9,274 7,056
Acquisition costs                     0
Impairment of goodwill and indefinite-lived intangibles                 0    
Restructuring costs                 289 849 413
Depreciation and amortization expense                 2,323 2,537 2,924
Capital expenditures                 2,483 4,297 2,179
Total assets 82,637       77,756       82,637 77,756 64,934
Weighing and Control Systems                      
Segment Reporting Information [Line Items]                      
Gross profit                 39,704 32,336 27,809
Segment operating income (loss)                 20,508 14,770 10,221
Acquisition costs                     67
Impairment of goodwill and indefinite-lived intangibles                 0    
Restructuring costs                 0 602 837
Depreciation and amortization expense                 2,121 2,133 2,323
Capital expenditures                 1,370 823 1,551
Total assets 95,954       97,007       95,954 97,007 90,447
Operating Segments | Foil Technology Products                      
Segment Reporting Information [Line Items]                      
Net revenues                 141,009 116,272 100,942
Operating Segments | Force Sensors                      
Segment Reporting Information [Line Items]                      
Net revenues                 73,186 65,446 60,234
Operating Segments | Weighing and Control Systems                      
Segment Reporting Information [Line Items]                      
Net revenues                 85,599 72,632 63,753
Corporate/ Other                      
Segment Reporting Information [Line Items]                      
Net revenues                 0 0 0
Gross profit                 0 0 0
Segment operating income (loss)                 (32,203) (27,982) (26,401)
Acquisition costs                     0
Impairment of goodwill and indefinite-lived intangibles                 0    
Restructuring costs                 0 508 279
Depreciation and amortization expense                 1,014 1,010 1,008
Capital expenditures                 147 453 179
Total assets $ 14,874       $ 12,613       14,874 12,613 15,718
Intersegment revenues                      
Segment Reporting Information [Line Items]                      
Net revenues                 (5,820) (4,573) (5,112)
Intersegment revenues | Foil Technology Products                      
Segment Reporting Information [Line Items]                      
Net revenues                 3,878 2,316 2,340
Intersegment revenues | Force Sensors                      
Segment Reporting Information [Line Items]                      
Net revenues                 1,365 1,346 1,954
Intersegment revenues | Weighing and Control Systems                      
Segment Reporting Information [Line Items]                      
Net revenues                 $ 577 $ 911 $ 818
[1] The Company reports interim financial information for the 13-week periods beginning on a Sunday and ending on a Saturday, except for the first fiscal quarter, which always begins on January 1, and the fourth fiscal quarter, which always ends on December 31. The first, second, third, and fourth quarters of 2018 ended on March 31, June 30, September 29, and December 31, respectively. The first, second, third, and fourth quarters of 2017 ended on April 1, July 1, September 30, and December 31, respectively.