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SEGMENT REPORTING SEGMENT REPORTING - Major customers (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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. + Details
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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 + Details
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