Note 1 - Organization and Significant Accounting Policies (Details Textual)	12 Months Ended
Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Software Development Costs, Useful Life		1 year 180 days
Capitalized Computer Software, Net		$ 1,597,000
Capitalized Computer Software, Amortization	$ 1,089,000	2,090,000
Standard and Extended Product Warranty Accrual	856,000	830,000
Product Warranty Expense	73,000	159,000
Extended Product Warranty Accrual, Increase for Warranties Issued	162,000	495,000
Extended Product Warranty Accrual	155,000	333,000
Other Liabilities	$ 7,000	$ 162,000
Multi Employer Plans Collective Bargaining Arrangement Number of Participants	335
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Participants	55.00%
Reclassification from Assets to Reduce Long-term Debt [Member] \| December 31, 2015 [Member]
Prior Period Reclassification Adjustment	$ 1,220,000
Employee Benefit Related Adjustments Mexico [Member]
Multi Employer Plans Collective Bargaining Arrangement Number of Participants	196
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Participants	32.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Concentration Risk, Percentage	41.00%	37.00%
Number of Major Customers	3	3
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer Sistemas [Member]
Concentration Risk, Percentage	15.00%	16.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer Meritor [Member]
Concentration Risk, Percentage	14.00%	11.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer Tyco [Member]
Concentration Risk, Percentage	12.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer ITT Exelis [Member]
Concentration Risk, Percentage		10.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer Sistemas [Member]
Concentration Risk, Percentage	12.00%	11.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer Meritor [Member]
Concentration Risk, Percentage	19.00%	30.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer Detroit Diesel [Member]
Concentration Risk, Percentage	10.00%	10.00%
Sales Revenue, Net [Member] \| Government Contracts Concentration Risk [Member]
Concentration Risk, Percentage	3.00%	5.00%
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year [Member]
Multi Employer Plans Collective Bargaining Arrangement Number of Participants	139
Land, Buildings and Improvements [Member]
Property, Plant and Equipment, Useful Life	40 years
Furniture and Fixtures [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Furniture and Fixtures [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life	15 years
Machinery and Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life		3 years
Machinery and Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life		15 years

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Useful life of software development used in the normal conduct of business.

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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

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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.

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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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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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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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