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Goodwill and Other Intangible Assets (Summary of Goodwill Activity) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Beginning balance $ 19,181 $ 18,717
Impairment charges (2,500)  
Foreign currency translation adjustment (540) 464
Ending balance 16,141 19,181
KELK | Weighing and Control Systems    
Goodwill [Roll Forward]    
Beginning balance 6,828 6,364
Impairment charges 0  
Foreign currency translation adjustment (540) 464
Ending balance 6,288 6,828
Stress-Tek, Inc. | Weighing and Control Systems    
Goodwill [Roll Forward]    
Beginning balance 6,311 6,311
Impairment charges 0  
Foreign currency translation adjustment 0 0
Ending balance 6,311 6,311
Pacific Instruments, Inc. | Foil Technology Products    
Goodwill [Roll Forward]    
Beginning balance 6,042 6,042
Impairment charges (2,500)  
Foreign currency translation adjustment 0 0
Ending balance $ 3,542 $ 6,042