Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Revenue Disaggregated by Product Line and Geographic Area (Detail)

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Revenue Recognition - Revenue Disaggregated by Product Line and Geographic Area (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Disaggregation Of Revenue [Line Items]        
Net sales $ 25,286 $ 17,198 $ 67,522 $ 68,190
Heat Transfer Equipment [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 7,062 5,164 21,394 15,495
Vacuum Equipment [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 12,969 3,765 27,232 28,823
All Other [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 5,255 8,269 18,896 23,872
Asia [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 723 966 4,960 5,591
Canada [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 2,666 549 5,910 15,672
Middle East [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 7,498 806 8,783 1,705
South America [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 808 47 3,284 239
U.S. [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 13,409 14,320 43,589 42,846
All Other [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales $ 182 $ 510 $ 996 $ 2,137