Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Revenue Recognition - Revenue Disaggregated by Product Line and Geographic Area (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation Of Revenue [Line Items]        
Net sales $ 21,643 $ 21,441 $ 42,236 $ 50,992
Heat Transfer Equipment [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 6,479 6,173 14,331 10,331
Vacuum Equipment [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 8,733 7,842 14,263 25,058
All Other [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 6,431 7,426 13,642 15,603
Asia [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 1,018 1,876 4,237 4,625
Canada [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 1,896 3,473 3,244 15,123
Middle East [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 512 464 1,285 899
South America [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 2,117 68 2,476 192
U.S. [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 15,731 15,073 30,179 28,526
All Other [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales $ 369 $ 487 $ 815 $ 1,627