Warranty Reserves (Tables)
 3 Months Ended
May 31, 2019
Product Warranties Disclosures [Abstract]  
Changes in the warranty reserves
The following table shows the changes in the warranty reserves for the three months ended May 31, 2019 (in thousands):
 
 
Warranty Reserve
Balance at February 28, 2019
$
1,751

Warranty costs incurred
(1,232
)
Additions charged to income
2,642

Balance at May 31, 2019
$
3,161