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Note 1 - Organization and Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Jan. 01, 2018 USD ($)
Number of Operating Segments	2
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Standard and Extended Product Warranty Accrual, Ending Balance	$ 582,000	$ 666,000
Product Warranty Expense	$ 136,000	253,000
Multi Employer Plans Collective Bargaining Arrangement Number of Participants	459
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Participants	64.00%
Retained Earnings (Accumulated Deficit), Ending Balance	$ (114,926,000)	(111,591,000)	$ (111,421,000)
Revenue from Contract with Customer, Including Assessed Tax	87,969,000	82,294,000
Net Income (Loss) Attributable to Parent, Total	$ (3,505,000)	$ (10,822,000)
Earnings Per Share, Basic, Total | $ / shares	$ (0.17)	$ (0.53)
Operating Leases, Future Minimum Payments Due, Total	$ 11,273,000
Operating Income (Loss), Total	(4,296,000)	$ (12,146,000)
Other Nonoperating Income (Expense), Total	1,436,000	1,515,000
Accounting Standards Update 2014-09 [Member]
Retained Earnings (Accumulated Deficit), Ending Balance			$ 170,000
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Retained Earnings (Accumulated Deficit), Ending Balance	63,000
Revenue from Contract with Customer, Including Assessed Tax	600,000
Net Income (Loss) Attributable to Parent, Total	$ (106,000)
Earnings Per Share, Basic, Total | $ / shares	$ (0.01)
Operating Income (Loss), Total	$ (106,000)
Other Nonoperating Income (Expense), Total	0
Accounting Standards Update 2018-11 [Member]
Operating Leases, Future Minimum Payments Due, Total	11,273,000
Cumulative Effect on Retained Earnings, Net of Tax, Total	$ 1,442,000
Accounting Standards Update 2016-18 [Member]
Cash, Period Increase (Decrease), Total		(1,500,000)
Accounting Standards Update 2017-07 [Member]
Operating Income (Loss), Total		398,000
Other Nonoperating Income (Expense), Total		$ 398,000
Collective Bargaining Agreements That Expire in Next 12 Months [Member]
Multi Employer Plans Collective Bargaining Arrangement Number of Participants	36
Employee Benefit Related Adjustments Mexico [Member]
Multi Employer Plans Collective Bargaining Arrangement Number of Participants	423
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Participants	59.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage	40.00%	30.00%
Number of Major Customers	2	2
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Sistemas [Member]
Concentration Risk, Percentage	22.00%	15.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Northrop Grumman [Member]
Concentration Risk, Percentage	18.00%	15.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer Sistemas [Member]
Concentration Risk, Percentage	19.00%	13.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Northrop Grumman [Member]
Concentration Risk, Percentage	14.00%	13.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer Detroit Diesel [Member]
Concentration Risk, Percentage	14.00%	14.00%
Minimum [Member] | Accounting Standards Update 2018-11 [Member]
Operating Lease, Right-of-Use Asset	$ 7,000,000
Operating Lease, Liability, Total	7,500,000
Maximum [Member] | Accounting Standards Update 2018-11 [Member]
Operating Lease, Right-of-Use Asset	8,000,000
Operating Lease, Liability, Total	$ 8,500,000
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
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	15 years

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