Note 1 - Organization and Significant Accounting Policies (Details Textual)	12 Months Ended
Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Number of Operating Segments	2
Standard and Extended Product Warranty Accrual, Ending Balance	$ 638,000	$ 569,000
Product Warranty Expense	$ 294,000	$ 156,000
Multi Employer Plans Collective Bargaining Arrangement Number of Participants	386
Multiemployer Plan, Pension, Significant, Employees Covered by Collective-Bargaining Arrangement to All Participants, Percentage	58.00%
Employee Benefit Related Adjustments Mexico [Member]
Multi Employer Plans Collective Bargaining Arrangement Number of Participants	350
Multiemployer Plan, Pension, Significant, Employees Covered by Collective-Bargaining Arrangement to All Participants, Percentage	53.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Concentration Risk, Percentage	53.00%	27.00%
Number of Major Customers	4	2
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer Sistemas [Member]
Concentration Risk, Percentage	17.00%	17.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer Detroit Diesel [Member]
Concentration Risk, Percentage	14.00%	10.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| CECO Peerless [Member]
Concentration Risk, Percentage	11.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Tremec [Member]
Concentration Risk, Percentage	11.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Customer Sistemas [Member]
Concentration Risk, Percentage	14.00%	22.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Customer Detroit Diesel [Member]
Concentration Risk, Percentage	12.00%	14.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Northrop Grumman [Member]
Concentration Risk, Percentage	22.00%	11.00%
Land Improvements, Buildings and Building Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)	40 years
Machinery, Equipment, Furniture, and Fixtures [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Machinery, Equipment, Furniture, and Fixtures [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	15 years

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

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Represents number of Major Customers.

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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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

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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.

+ References

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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.

+ References

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