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Warranty Reserves (Tables)
 9 Months Ended
Nov. 30, 2018
Product Warranties Disclosures [Abstract]  
Changes in the warranty reserves
The following table shows the changes in the warranty reserves for the nine month period ended November 30, 2018 (in thousands):
 
 
Warranty Reserve
Balance at February 28, 2018
$
2,013

Warranty costs incurred
(1,674
)
Additions charged to income
1,561

Balance at November 30, 2018
$
1,900