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Note 2 - Acquisition (Details Textual) - USD ($) $ in Thousands		9 Months Ended
	May 01, 2019	Sep. 29, 2019	Sep. 30, 2018
Payments to Acquire Businesses, Net of Cash Acquired, Total		$ 25,248
Share-based Payment Arrangement, Noncash Expense, Total		519	707
Payments of Debt Issuance Costs		157
Southwest Electronic Energy Corporation [Member]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		11,993
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		740
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory		264
Business Combination, Acquisition Related Costs		165
Business Combination, Interest Expense, Financing		289
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles		101
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment		55
Share-based Payment Arrangement, Noncash Expense, Total		49
Southwest Electronic Energy Corporation [Member]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Payments to Acquire Businesses, Net of Cash Acquired, Total	$ 26,190
Cash Acquired from Acquisition	$ 942
Business Combination, Acquisition Related Costs		322
Payments of Debt Issuance Costs		$ 157
Long-term Debt, Weighted Average Term		4 years 219 days
Southwest Electronic Energy Corporation [Member] | Accounting, Legal, and Due Diligence Services [Member]
Business Combination, Acquisition Related Costs		$ 165

X

- Definition

The amount of interest expense related to financing for a business combination.

+ References

No definition available.

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X

- Definition

The weighted average term of long-term debt.

+ References

No definition available.

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X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460

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X

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
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- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
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- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to intangibles acquired in connection with a business combination for which the initial accounting was incomplete.

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-SubTopic 20
-Section 50
-Paragraph 4A
-Subparagraph (c)
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- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to inventory acquired in connection with a business combination for which the initial accounting was incomplete.

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- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to property, plant, and equipment acquired in connection with a business combination for which the initial accounting was incomplete.

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- Definition

The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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- Definition

Amount of noncash expense for share-based payment arrangement.

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