Note 1 - Organization and Significant Accounting Policies (Details Textual)	12 Months Ended
Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Number of Operating Segments	2
Standard and Extended Product Warranty Accrual, Ending Balance	$ 690,000	$ 659,000
Product Warranty Expense	$ 251,000	$ 252,000
Multi Employer Plans Collective Bargaining Arrangement Number of Participants	415
Multiemployer Plan, Employees Covered by Collective-Bargaining Arrangement, Subject to Expiration in 12 Months	0
Employee Benefit Related Adjustments Mexico [Member]
Multi Employer Plans Collective Bargaining Arrangement Number of Participants	394
Multiemployer Plan, Pension, Significant, Employees Covered by Collective-Bargaining Arrangement to All Entity's Employees, Percentage	58.00%
Multiemployer Plan, Pension, Significant, Employees Covered by Collective-Bargaining Arrangement to All Participants, Percentage	55.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Two Customers [Member]
Concentration Risk, Percentage	31.00%
Number of Major Customers	3
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer Subcom [Member]
Concentration Risk, Percentage	18.00%	11.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer Detroit Diesel [Member]
Concentration Risk, Percentage	13.00%	25.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Three Customers [Member]
Concentration Risk, Percentage		53.00%
Number of Major Customers		4
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer ADI [Member]
Concentration Risk, Percentage		13.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Customer Detroit Diesel [Member]
Concentration Risk, Percentage	18.00%	18.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Customer Sistemas [Member]
Concentration Risk, Percentage	22.00%	21.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Northrop Grumman [Member]
Concentration Risk, Percentage	14.00%	16.00%
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
Capitalized Implementation Costs [Member]
Prepaid Expense and Other Assets	$ 204,000	$ 89,000

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

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Number of entity's employees covered by collective-bargaining arrangement (CBA) to all participants in multiemployer pension plan, subject to expiration in next twelve months.

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Represents number of Major Customers.

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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 entity's employees covered by collective-bargaining arrangement (CBA) to all entity's employees in multiemployer pension plan determined to be individually significant.

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Percentage of entity's employees covered by collective-bargaining arrangement (CBA) to all participants in multiemployer pension plan determined to be individually significant.

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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.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets.

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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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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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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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