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Business Segments And Enterprise-Wide Disclosures (Tables)
 6 Months Ended
Sep. 30, 2012
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, 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
)
Three Months Ended September 30, 2011
 
 
 
 
 
 
 
Sales to external customers
$
9,786

 
$
12,066

 
$
—

 
$
21,852

Gross margin
6,144

 
4,217

 
—

 
10,361

Income (loss) from operations
886

 
2,561

 
(3,830
)
 
(383
)
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
)
Six Months ended September 30, 2011
 
 
 
 
 
 
 
Sales to external customers
$
19,382

 
$
24,878

 
$
—

 
$
44,260

Gross margin
12,306

 
8,315

 
—

 
20,621

Income (loss) from operations
2,673

 
4,910

 
(7,720
)
 
(137
)