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Segment Reporting - Summary of Segmented Data (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenue from External Customers	$ 4,761	$ 3,710
Intersegment revenues
Segment gross profit	$ 1,631	$ 1,242
Depreciation and amortization	71	74
Segment net income (loss) before income taxes	(198)	(467)
Energy & Security Sonar Solutions [Member]
Segment Reporting Information [Line Items]
Revenue from External Customers	$ 3,582	$ 2,660
Intersegment revenues
Segment gross profit	$ 1,133	$ 605
Depreciation and amortization	43	45
Segment net income (loss) before income taxes	67	(294)
PGM [Member]
Segment Reporting Information [Line Items]
Revenue from External Customers	$ 667	$ 553
Intersegment revenues
Segment gross profit	$ 333	$ 340
Depreciation and amortization	16	18
Segment net income (loss) before income taxes	(239)	(278)
Other [Member]
Segment Reporting Information [Line Items]
Revenue from External Customers	$ 512	$ 497
Intersegment revenues
Segment gross profit	$ 165	$ 297
Depreciation and amortization	12	11
Segment net income (loss) before income taxes	$ (26)	$ 105

X

- Definition

Intersegment revenues.

+ References

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- Definition

Segment net income (loss) before income taxes

+ References

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ 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 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ 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=63488584&loc=d3e20235-122688

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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