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SEGMENT REPORTING SEGMENT REPORTING - Major customers (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue, Major Customer [Line Items]
Revenues	$ 4,796	$ 4,713	$ 5,727	$ 4,183	$ 6,675	$ 5,051	$ 4,107	$ 3,095	$ 19,419	$ 18,928	$ 14,244
Energy & Security Sonar Solutions Segment [Member] | Customer A [Member]
Revenue, Major Customer [Line Items]
Revenues									409	1,104	3,998
Percent of total revenues									2.00%	6.00%	28.00%
Energy & Security Sonar Solutions Segment [Member] | Customer B [Member]
Revenue, Major Customer [Line Items]
Revenues									309	89	1,725
Percent of total revenues									2.00%	0.00%	12.00%
Energy & Security Sonar Solutions Segment [Member] | Customer C [Member]
Revenue, Major Customer [Line Items]
Revenues									1,504	2,094	529
Percent of total revenues									8.00%	11.00%	4.00%
Energy & Security Sonar Solutions Segment [Member] | Customer D [Member]
Revenue, Major Customer [Line Items]
Revenues									7,434	2,155	0
Percent of total revenues									38.00%	11.00%	0.00%
GridSense segment [Member] | Customer E [Member]
Revenue, Major Customer [Line Items]
Revenues									$ 187	$ 2,436	$ 5
Percent of total revenues									1.00%	13.00%	0.00%

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- Definition

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

+ References

No definition available.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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