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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Sales Revenue, Goods, Net [Abstract]    
Sales Revenue, Goods, Net $ 24,344 $ 22,961
External Sales [Member]    
Sales Revenue, Goods, Net [Abstract]    
Sales Revenue, Goods, Net 24,340 22,960
USA [Member]    
Sales Revenue, Goods, Net [Abstract]    
Sales Revenue, Goods, Net 13,310 13,400
USA [Member] | External Sales [Member]    
Sales Revenue, Goods, Net [Abstract]    
Sales Revenue, Goods, Net 12,350 12,700
Other foreign [Member]    
Sales Revenue, Goods, Net [Abstract]    
Sales Revenue, Goods, Net 5,110 4,050
Other foreign [Member] | External Sales [Member]    
Sales Revenue, Goods, Net [Abstract]    
Sales Revenue, Goods, Net 4,350 3,700
Europe (UK) [Member]    
Sales Revenue, Goods, Net [Abstract]    
Sales Revenue, Goods, Net 2,570 2,130
Europe (UK) [Member] | External Sales [Member]    
Sales Revenue, Goods, Net [Abstract]    
Sales Revenue, Goods, Net 2,570 2,090
Mexico [Member]    
Sales Revenue, Goods, Net [Abstract]    
Sales Revenue, Goods, Net 1,470 920
Mexico [Member] | External Sales [Member]    
Sales Revenue, Goods, Net [Abstract]    
Sales Revenue, Goods, Net 1,110 570
CHINA [Member]    
Sales Revenue, Goods, Net [Abstract]    
Sales Revenue, Goods, Net 13,830 10,520
CHINA [Member] | External Sales [Member]    
Sales Revenue, Goods, Net [Abstract]    
Sales Revenue, Goods, Net $ 3,950 $ 3,900