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Business Segments And Enterprise-Wide Disclosures (Tables)
 6 Months Ended
Sep. 30, 2013
Segment Reporting, Measurement Disclosures [Abstract]  
Information by segment
Certain information by segment was as follows (dollars in thousands):
 
AMI
 
HE
 
Other
 
Total
Three Months Ended September 30, 2013
 
 
 
 
 
 
 
Sales to external customers
$
16,961

 
$
12,514

 
$
—

 
$
29,475

Gross margin
10,131

 
3,481

 
—

 
13,612

Income (loss) from operations
1,603

 
2,232

 
(4,890
)
 
(1,055
)
Three Months Ended September 30, 2012
 
 
 
 
 
 
 
Sales to external customers
$
13,230

 
$
9,261

 
$
—

 
$
22,491

Gross margin
7,764

 
2,942

 
—

 
10,706

Income (loss) from operations
(15,691
)
 
1,694

 
(4,421
)
 
(18,418
)
Six Months ended September 30, 2013
 
 
 
 
 
 
 
Sales to external customers
$
32,719

 
$
25,598

 
$
—

 
$
58,317

Gross margin
19,601

 
7,161

 
—

 
26,762

Income (loss) from operations
3,369

 
4,433

 
(9,877
)
 
(2,075
)
Six Months ended September 30, 2012
 
 
 
 
 
 
 
Sales to external customers
$
25,841

 
$
19,873

 
$
—

 
$
45,714

Gross margin
16,081

 
6,137

 
—

 
22,218

Income (loss) from operations
(13,749
)
 
3,493

 
(8,806
)
 
(19,062
)