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Note 5 - Business Acquisitions (Details Textual) |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 7 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 28, 2022 USD ($) | Sep. 28, 2022 EUR (€) | Sep. 27, 2022 USD ($) | May 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) | Aug. 31, 2021 USD ($) shares | Apr. 29, 2021 USD ($) | Dec. 24, 2022 USD ($) | Dec. 24, 2022 USD ($) | Dec. 24, 2022 USD ($) | Dec. 25, 2021 USD ($) | Dec. 24, 2022 USD ($) | Dec. 24, 2022 USD ($) | Dec. 24, 2022 USD ($) | Dec. 25, 2021 USD ($)
Revenues, Total | [1] |  |  |  |  |  |  |  |  | $ 57,402,000 |  | $ 50,902,000 |  |  | $ 168,502,000 | $ 149,079,000
Operating Income (Loss), Total |  |  |  |  |  |  |  |  |  | $ 3,163,000 |  | $ 2,361,000 |  |  | 10,393,000 | 9,628,000
General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 900,000
Complete Calibrations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
Operating Income (Loss), Total |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
e2b [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  |  |  | $ 900,000 |  |  |  |  |
Operating Income (Loss), Total |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  |  |
Alliance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000 |  |
Operating Income (Loss), Total |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |
Tangent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 |
Operating Income (Loss), Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |
Complete Calibrations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complete Calibrations [Member] | Technology License Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalties Per Technology Calibration |  | $ 3 | € 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Technology License Agreement, Term (Year) |  | 10 years | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative License Revenue |  | $ 800,000 | € 750,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Annual Royalty Fee, Amount |  | $ 100,000 | € 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
e2b [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  | $ 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Held Back |  |  |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |
Alliance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  | $ 4,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Held Back |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  |  |  |  | $ 4,700,000 |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares |  |  |  |  | 2,284 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Subject to Reduction |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |
Tangent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  | $ 7,900,000 |  |  |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  |  |  |  |  | $ 8,900,000 |  |  |  |  |  |  |  |  |  |
Escrow Deposit |  |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |
Cash Out of Escrow Account |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |
NEXA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  | $ 23,900,000 |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,800,000 |
Operating Income (Loss), Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  |  |  |  |  |  | $ 26,200,000 |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares |  |  |  |  |  |  | 34,943 |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  |  |  |  |  |  | $ 2,400,000 |  |  |  |  |  |  |  |  |
Escrow Deposit |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  |  |  |  | $ 7,500,000 |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Period (Year) |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total |  |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |  |
NEXA [Member] | Measurement Input, Cost to Sell [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  |  |  |  | 0.0660 |  |  |  |  |  |  |  |  |
NEXA [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  |  |  |  | 0.0058 |  |  |  |  |  |  |  |  |
NEXA [Member] | Measurement Input, Price Volatility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  |  |  |  | 0.2000 |  |  |  |  |  |  |  |  |
Upstate Metrology [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  |  |  |
Payment for Contingent Consideration Liability, Financing Activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0
[1] | Revenues are attributed to the countries based on the destination of a product shipment or the location where service is rendered.

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- Definition Amount of consideration in business combination held back for closing adjustments. + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI https://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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