Organization and Significant Accounting Policies (Details) (USD $)	12 Months Ended
Dec. 31, 2012 Employees Customers	Dec. 31, 2011 Customers
Organization and Significant Accounting Policies (Textual) [Abstract]
Employees covered by annually ratified collective agreement	411
Organization and Significant Accounting Policies (Additional Textual) [Abstract]
Estimated fair value of impaired goodwill exceeded carrying value	21.00%
Terminal growth rate	3.00%
Capitalized precontract cost	$ 0	$ 1,113,000
Tax benefit recognized	0
Warranty expense	422,000	460,000
Extended product warranty	Company sells three and five-year extended warranties for certain link encryption products
Extended warranties period 1	3 years
Extended warranties period 2	5 years
Deferred revenue recognize for extended warranties	2,607,000	2,536,000
Extended accrued liabilities	1,085,000	802,000
Recognized revenue from contracts, Percentage	6.00%	9.00%
Number of customer accounted for more than 10%	0	0
Collective bargaining agreements expiring description	Excluding certain Mexico employees covered under an annually ratified agreement, collective bargaining agreements covering 37 employees expire within the next 12 months
Number of employees under collective bargaining arrangement expiring with in next 12 months	37
Credit Concentration Risk [Member]
Organization and Significant Accounting Policies (Textual) [Abstract]
Number of largest customers	2
Accounts Receivable Outstanding Percentage	65.00%	74.00%
Entity Employee [Member]
Organization and Significant Accounting Policies (Textual) [Abstract]
Employees covered by annually ratified collective agreement	591
Employees covered by collective bargaining agreements, Percentage	46.00%
Mexico Employee [Member]
Organization and Significant Accounting Policies (Textual) [Abstract]
Employees covered by annually ratified collective agreement, Percentage	32.00%
Dana [Member] \| Credit Concentration Risk [Member]
Organization and Significant Accounting Policies (Textual) [Abstract]
Major customer revenue percentage of aggregate revenue	55.00%	54.00%
Accounts Receivable Outstanding Percentage	44.00%	56.00%
Meritor [Member] \| Credit Concentration Risk [Member]
Organization and Significant Accounting Policies (Textual) [Abstract]
Major customer revenue percentage of aggregate revenue	15.00%	13.00%
Accounts Receivable Outstanding Percentage	21.00%	18.00%
Product Warranty [Member]
Organization and Significant Accounting Policies (Textual) [Abstract]
Accrued liabilities	1,111,000	914,000
Other liabilities	$ 1,522,000	$ 1,734,000
Land, Buildings and Improvements [Member]
Organization and Significant Accounting Policies (Textual) [Abstract]
Estimated economic life	40 years
Maximum [Member] \| Machinery Equipment Furniture and Fixtures [Member]
Organization and Significant Accounting Policies (Textual) [Abstract]
Estimated economic life	15 years
Minimum [Member] \| Machinery Equipment Furniture and Fixtures [Member]
Organization and Significant Accounting Policies (Textual) [Abstract]
Estimated economic life	3 years

Deferred pre-contract costs.

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Entity wide accounts receivable due from major customer percentage.

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Extended warranties period one.

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Extended warranties period two.

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Estimated fair value of impaired goodwill.

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Income tax benefit recognized for tax position not more likely than not tax benefit sustained.

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- Definition

Multi employer plans collective bargaining arrangement number of participants.

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Multi employer plans collective bargaining arrangement percentage of participants.

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Multiemployer plans number of employees under collective bargaining arrangement expiring with in next twelve months.

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Number of customer accounted for generating revenue over ten percent.

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Number of major customers.

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

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- Definition

Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability.

+ References

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

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 14

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

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-Section 50

-Paragraph 8

-Subparagraph (c)(1),(c)(5)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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- Definition

Represents the aggregate increase in the liability for accruals related to extended product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to standard product warranties.

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-Name FASB Interpretation (FIN)

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-Paragraph 14

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Describes the nature of the extended product warranties, which generally require additional fees to be paid by the buyer, and other guarantee contracts excluded from the initial recognition and initial measurement requirements. Does not include disclosures for standard product warranties, which typically have substantially shorter periods of time or provide less coverage, or both.

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-Name Accounting Standards Codification

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- Definition

Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

Description of the significant collective-bargaining arrangements within the range of expiration dates for collective-bargaining arrangements requiring contributions to a multiemployer plan as well as other information to help investors understand the significance of the collective-bargaining agreements and when they expire. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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-SubTopic 80

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-Paragraph 5

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- Definition

Percentage of employee participants subject to a collective bargaining arrangement to all participants in a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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- Definition

The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Article 9

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(5))

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-Topic 942

-SubTopic 210

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-Number 210

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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- Definition

The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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The percentage of net product revenue to total net revenue from the sale of goods as of year end.

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