Schedule of Statements of Operations for Discontinued Operations (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Loss on sale		$ (9)
Test Product Line [Member]
Net Sales
Income (loss) from operations
Loss on sale		(9)
Provision for income taxes
Net (loss) income		$ (9)
(Loss) earnings per share, Basic and diluted
Weighted average shares outstanding, Basic and diluted		10,668

Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

+ References+ Details

Tax benefit from provision recognizing a loss for initial, or subsequent, write-down to fair value (less cost to sell) of a of a disposal group that is classified as a component of the entity, which remains unsold as of the reporting date. May include a tax on the (gain) for the recognition of a subsequent increase in fair value (less cost to sell), but not in excess of the cumulative loss previously recognized through write-downs.

+ References+ Details

- Definition

Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References

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+ Details