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Business Segments And Enterprise-Wide Disclosures (Tables)
 9 Months Ended
Dec. 31, 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 December 31, 2012
 
 
 
 
 
 
 
Sales to external customers
$
13,712

 
$
11,236

 
$
—

 
$
24,948

Gross margin
8,210

 
2,891

 
—

 
11,101

Income (loss) from operations
1,194

 
1,523

 
(4,486
)
 
(1,769
)
Three Months Ended December 31, 2011
 
 
 
 
 
 
 
Sales to external customers
$
10,393

 
$
11,818

 
$
—

 
$
22,211

Gross margin
6,868

 
3,753

 
—

 
10,621

Income (loss) from operations
1,100

 
2,019

 
(4,093
)
 
(974
)
Nine Months ended December 31, 2012
 
 
 
 
 
 
 
Sales to external customers
$
39,553

 
$
31,109

 
$
—

 
$
70,662

Gross margin
24,291

 
9,028

 
—

 
33,319

Income (loss) from operations
(12,555
)
 
5,016

 
(13,292
)
 
(20,831
)
Nine Months ended December 31, 2011
 
 
 
 
 
 
 
Sales to external customers
$
29,775

 
$
36,696

 
$
—

 
$
66,471

Gross margin
19,174

 
12,068

 
—

 
31,242

Income (loss) from operations
3,773

 
6,929

 
(11,814
)
 
(1,112
)