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Segment Information (Continuing Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 segment	Sep. 30, 2013	Dec. 31, 2013
Net revenues	$ 1,917	$ 1,708	$ 5,379	$ 4,813
Interest income	0	3	2	5
Purchase of property and equipment			45	18
Total assets	13,739		13,739		12,609
Income before income taxes	481	150	1,407	754
Number of reportable segments			2
Production Monitoring [Member]
Net revenues	1,917	1,708	5,379	4,813
Income before income taxes	223	18	397	220
Investments [Member]
Income before income taxes	$ 258	$ 132	$ 1,010	$ 534

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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X

- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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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.

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