Represents number of participants in multi employer plans collective bargaining arrangement.

No definition available.

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- Definition

Represents number of Major Customers.

+ References

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (d)
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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
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- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

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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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- 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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- 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.

+ References

No definition available.

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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Note 1 - Organization and Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)
Number of Operating Segments	2
Standard and Extended Product Warranty Accrual, Ending Balance	$ 569,000	$ 582,000
Product Warranty Expense	$ 156,000	136,000
Multi Employer Plans Collective Bargaining Arrangement Number of Participants	359
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Participants	57.00%
Operating Lease, Right-of-Use Asset	$ 7,014,000	0
Operating Lease, Liability, Total	7,747,000
Retained Earnings (Accumulated Deficit), Ending Balance	$ (117,433,000)	$ (114,926,000)
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset			$ 7,664,000
Operating Lease, Liability, Total			8,549,000
Retained Earnings (Accumulated Deficit), Ending Balance			$ (1,442,000)
Employee Benefit Related Adjustments Mexico [Member]
Multi Employer Plans Collective Bargaining Arrangement Number of Participants	319
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Participants	51.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Concentration Risk, Percentage	27.00%	40.00%
Number of Major Customers	2	2
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer Sistemas [Member]
Concentration Risk, Percentage	17.00%	18.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer Detroit Diesel [Member]
Concentration Risk, Percentage	10.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Northrop Grumman [Member]
Concentration Risk, Percentage		22.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Customer Sistemas [Member]
Concentration Risk, Percentage	22.00%	19.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Customer Detroit Diesel [Member]
Concentration Risk, Percentage	14.00%	14.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Northrop Grumman [Member]
Concentration Risk, Percentage	11.00%	14.00%
Land Improvements, Buildings and Building Improvements [Member]
Property, Plant and Equipment, Useful Life	40 years
Machinery, Equipment, Furniture, and Fixtures [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Machinery, Equipment, Furniture, and Fixtures [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life	15 years