Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Revenue Recognition - Revenue Disaggregated by Product Line and Geographic Area (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Disaggregation Of Revenue [Line Items]        
Net sales $ 17,198 $ 17,281 $ 68,190 $ 55,356
Heat Transfer Equipment [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 5,164 7,608 15,495 18,591
Vacuum Equipment [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 3,765 3,858 28,823 15,270
All Other [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 8,269 5,815 23,872 21,495
Asia [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 966 2,264 5,591 8,228
Canada [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 549 1,847 15,672 5,046
Middle East [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 806 1,023 1,705 2,958
South America [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 47 485 239 1,055
U.S. [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 14,320 11,301 42,846 37,276
All Other [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales $ 510 $ 361 $ 2,137 $ 793