Entity Central Index Key Document and entity information. Document And Entity Information [Abstract] Document Information [Table] Document Information [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Common Stock Common Class A [Member] Common Class B Common Class B [Member] Document Information [Line Items] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Document Type Document Type Trading Symbol Trading Symbol Document Period End Date Document Period End Date Amendment Flag Amendment Flag Current Fiscal Year End Date Current Fiscal Year End Date Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Accounts receivable, less allowance of $333 and $309, respectively Accounts Receivable Net Current Inventories, net Inventory Net Prepaid expenses and other assets Prepaid Expense And Other Assets Current Investments - current Short Term Investments Total current assets Assets Current Non-current assets: Assets Noncurrent [Abstract] Property, plant and equipment, net Property Plant And Equipment Net Goodwill Goodwill Intangible assets, net Intangible Assets Net Excluding Goodwill Non-current deferred income taxes Deferred Tax Assets Net Noncurrent Total non-current assets Assets Noncurrent Total assets Assets Liabilities and Stockholders’ Equity Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued liabilities Accrued Liabilities Current Total current liabilities Liabilities Current Non-current liabilities: Liabilities Noncurrent [Abstract] Non-current deferred income tax liabilities Accrued Income Taxes Noncurrent Other non-current liabilities Other Liabilities Noncurrent Total non-current liabilities Liabilities Noncurrent Total liabilities Liabilities Stockholders’ equity Stockholders Equity [Abstract] Common stock, $0.05 par value; issued and outstanding 10,953 shares at December 1, 2018 and 10,806 shares at June 2, 2018 Class B common stock, convertible, $0.05 par value; issued and outstanding 2,097 shares at December 1, 2018 and 2,137 shares at June 2, 2018 Common Stock Value Preferred stock, $1.00 par value, no shares issued Preferred Stock Value Additional paid-in-capital Additional Paid In Capital Common stock in treasury, at cost, no shares at December 1, 2018 and June 2, 2018 Treasury Stock Value Retained earnings Retained Earnings Accumulated Deficit Accumulated other comprehensive income Accumulated Other Comprehensive Income Loss Net Of Tax Total stockholders’ equity Stockholders Equity Total liabilities and stockholders’ equity Liabilities And Stockholders Equity Allowance for accounts receivable Allowance For Doubtful Accounts Receivable Current Common stock, par value (in dollars per share) Common Stock Par Or Stated Value Per Share Common stock, issued (in shares) Common Stock Shares Issued Common stock, outstanding (in shares) Common Stock Shares Outstanding Preferred stock, par value (in dollars per share) Preferred Stock Par Or Stated Value Per Share Preferred Stock, issued (in shares) Preferred Stock Shares Issued Common stock in treasury (in shares) Treasury Stock Common Shares Net income loss per common share basic. Net income (loss) per common share diluted abstract. Weighted average number of shares. Income Statement [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Net sales Revenue From Contract With Customer Excluding Assessed Tax Cost of sales Cost Of Revenue Gross profit Gross Profit Selling, general and administrative expenses Selling General And Administrative Expense Gain on disposal of assets Gain Loss On Disposition Of Assets Operating (loss) income Operating Income Loss Other (income) expense: Nonoperating Income Expense [Abstract] Investment/interest income Investment Income Net Foreign exchange (gain) loss Foreign Currency Transaction Gain Loss Before Tax Other, net Other Nonoperating Income Expense Total other (income) expense Nonoperating Income Expense (Loss) income from continuing operations before income taxes Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments Income tax provision Income Tax Expense Benefit (Loss) income from continuing operations Income Loss From Continuing Operations Income from discontinued operations Income Loss From Discontinued Operations Net Of Tax Net (loss) income Net Income Loss Foreign currency translation (loss) gain, net of tax Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Fair value adjustments on investments loss Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax Comprehensive (loss) income Comprehensive Income Net Of Tax Net (loss) income per Common share - Basic: Net Income Loss Per Common Share Basic [Abstract] (Loss) income from continuing operations Income Loss From Continuing Operations Per Basic Share Income from discontinued operations Income Loss From Discontinued Operations Net Of Tax Per Basic Share Total net (loss) income per Common share - Basic Earnings Per Share Basic Net (loss) income per Common share - Diluted: Net Income Loss Per Common Share Diluted [Abstract] (Loss) income from continuing operations Income Loss From Continuing Operations Per Diluted Share Income from discontinued operations Income Loss From Discontinued Operations Net Of Tax Per Diluted Share Total net (loss) income per Common share - Diluted Earnings Per Share Diluted Weighted average number of shares: Weighted Average Number Of Shares [Abstract] Common shares - Basic Weighted Average Number Of Shares Outstanding Basic Common shares - Diluted Weighted Average Number Of Diluted Shares Outstanding Dividends per share Common Stock Dividends Per Share Declared Represents inventory provisions. Statement Of Cash Flows [Abstract] Operating activities: Net Cash Provided By Used In Operating Activities [Abstract] Net (loss) income Adjustments to reconcile net (loss) income to cash provided by (used in) operating activities: Adjustments Noncash Items To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization Depreciation Depletion And Amortization Inventory provisions Inventory Provisions Loss (gain) on sale of investments Gain Loss On Sale Of Investments Gain on disposal of assets Assets Disposed Of By Method Other Than Sale In Period Of Disposition Gain Loss On Disposition1 Share-based compensation expense Share Based Compensation Deferred income taxes Deferred Income Taxes And Tax Credits Change in assets and liabilities: Increase Decrease In Operating Assets [Abstract] Accounts receivable Increase Decrease In Accounts Receivable Inventories Increase Decrease In Inventories Prepaid expenses and other assets Increase Decrease In Prepaid Expense Accounts payable Increase Decrease In Accounts Payable Accrued liabilities Increase Decrease In Accrued Liabilities Other Increase Decrease In Other Operating Capital Net Net cash provided by (used in) operating activities Net Cash Provided By Used In Operating Activities Investing activities: Net Cash Provided By Used In Investing Activities [Abstract] Capital expenditures Payments To Acquire Productive Assets Proceeds from sale of assets Proceeds From Sale Of Productive Assets Proceeds from maturity of investments Proceeds From Sale Of Longterm Investments Purchases of investments Payments To Acquire Longterm Investments Proceeds from sales of available-for-sale securities Proceeds From Sale Of Available For Sale Securities Purchases of available-for-sale securities Payments To Acquire Available For Sale Securities Other Payments For Proceeds From Other Investing Activities Net cash (used in) provided by investing activities Net Cash Provided By Used In Investing Activities Financing activities: Net Cash Provided By Used In Financing Activities [Abstract] Proceeds from issuance of common stock Proceeds From Issuance Of Common Stock Cash dividends paid Payments Of Dividends Common Stock Net cash used in financing activities Net Cash Provided By Used In Financing Activities Effect of exchange rate changes on cash and cash equivalents Effect Of Exchange Rate On Cash And Cash Equivalents Decrease in cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Statement Of Stockholders Equity [Abstract] Dividends per common share Common Stock Dividends Per Share Cash Paid Amount of paid and unpaid Class B common stock dividends declared with the form of settlement in cash. Common stock 1. Par value Common Stock1 [Member] Additional Paid-in Capital Additional Paid In Capital [Member] Common Stock in Treasury Treasury Stock [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income [Member] Beginning Balance Beginning Balance (in shares) Comprehensive (loss) income Comprehensive Income Net Of Tax [Abstract] Net income Foreign currency translation Share-based compensation: Share Based Compensation [Abstract] Restricted stock Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition Stock options Adjustments To Additional Paid In Capital Share Based Compensation Stock Options Requisite Service Period Recognition Options exercised Stock Issued During Period Value Stock Options Exercised Options exercised (in shares) Stock Issued During Period Shares Stock Options Exercised Restricted stock issuance Stock Issued During Period Value Restricted Stock Award Gross Restricted stock issuance (in shares) Stock Issued During Period Shares Restricted Stock Award Gross Converted Class B to common (in shares) Stock Issued During Period Shares Conversion Of Convertible Securities Dividends paid to: Dividends [Abstract] Common ($0.12 per share) Dividends Common Stock Cash Class B ($0.108 per share) Dividends Common Stock Cash Class B Ending Balance Ending Balance (in shares) Description Of Company Description Of Company [Abstract] Description of the Company Nature Of Operations Basis Of Presentation Basis Of Presentation [Abstract] Basis of Presentation Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Accounting Policies [Abstract] Critical Accounting Policies and Estimates Significant Accounting Policies [Text Block] Revenue From Contract With Customer [Abstract] Revenue Recognition Revenue From Contract With Customer [Text Block] Goodwill And Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Goodwill And Intangible Assets Disclosure [Text Block] Investments Debt And Equity Securities [Abstract] Investments Marketable Securities [Text Block] Guarantees [Abstract] Warranties Product Warranty Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Lease Obligations, Other Commitments, and Contingencies Commitments And Contingencies Disclosure [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Earnings Per Share [Abstract] Calculation of Earnings Per Share Earnings Per Share [Text Block] Segment Reporting [Abstract] Segment Reporting Segment Reporting Disclosure [Text Block] Litigation Litigation [Abstract] Litigation Legal Matters And Contingencies [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Related Party Transactions [Abstract] Related Party Transaction Related Party Transactions Disclosure [Text Block] Inventories, Net Inventory Policy [Text Block] Revenue Recognition Revenue From Contract With Customer Policy [Text Block] Loss Contingencies Commitments And Contingencies Policy [Text Block] Goodwill and Intangible Assets Intangible Assets Finite Lived Policy Income Taxes Income Tax Policy [Text Block] Accrued Liabilities, Policy Accrued Liabilities Accrued Liabilities Policy [Text Block] Lease Obligations, Other Commitments and Contingencies Lessee Leases Policy [Text Block] Schedule of Accrued Liabilities Schedule Of Accrued Liabilities Table [Text Block] Schedule of Contract Liabilities and Revenue Recognized Contract With Customer Asset And Liability Table [Text Block] Schedule of Intangible Assets Subject to Amortization Schedule Of Finite Lived Intangible Assets Table [Text Block] Schedule of the Amortization Expense for the Next Five Years Scheduleof Finite Lived Intangible Assets Future Amortization Expense Table [Text Block] Schedule of Future Lease Commitments for Minimum Rentals, Including Common Area Maintenance Charges and Property Taxes Operating Leases Of Lessee Disclosure [Text Block] Schedule of earnings per share, basic and diluted Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Schedule of Operating Results by Segment Schedule Of Segment Reporting Information By Segment [Text Block] Schedule of Net Sales and Gross Profit by Geographic Region Schedule Of Revenue From External Customers Attributed To Foreign Countries By Geographic Area [Text Block] Schedule of Investments Measured at Fair Value on a Recurring Basis Fair Value Assets Measured On Recurring Basis [Text Block] Description Of Company Details Narrative Description Of Company Details Narrative [Abstract] Number of operating segments Number Of Operating Segments Number of reportable segments Number Of Reportable Segments Finished goods Inventory Finished Goods Raw material Inventory Raw Materials Work in progress Inventory Work In Process Inventory valuation reserves Inventory Valuation Reserves The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as deferred revenue. Accrued Liabilities: Accrued Liabilities Current And Noncurrent [Abstract] Compensation and payroll taxes Accrued Payroll Taxes Current Accrued severance Supplemental Unemployment Benefits Severance Benefits Professional fees Accrued Professional Fees Current Deferred revenue Accrued Deferred Revenue Current Other accrued expenses Other Accrued Liabilities Current Accrued Liabilities Services revenue recognized as percentage of aggregate revenue. Revenue recognition. Schedule of revenue recognition. Schedule Of Revenue Recognition [Table] Schedule Of Revenue Recognition [Table] Range Range [Axis] Range Range [Member] Maximum Maximum [Member] Minimum Minimum [Member] Revenue Recognition [Line Items] Revenue Recognition [Line Items] Services revenue recognized as percentage of aggregate revenue Services Revenue Recognized As Percentage Of Aggregate Revenue Contract with customer liability contract additions. Contract Liabilities (Deferred Revenue), Beginning Balance Contract With Customer Liability Contract Liabilities (Deferred Revenue), Additions Contract With Customer Liability Contract Additions Contract Liabilities (Deferred Revenue), Revenue Recognized Contract With Customer Liability Revenue Recognized Contract Liabilities (Deferred Revenue), Ending Balance Extended product warranty period. Assurance product warranty period. Extended product warranty period Extended Product Warranty Period Assurance product warranty period on parts Assurance Product Warranty Period Schedule Of Finite Lived Intangible Assets [Table] Schedule Of Finite Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name Finite Lived Intangible Assets Major Class Name [Domain] Trade Names Trade Names [Member] Customer Relationships Customer Relationships [Member] Non-compete Agreements Noncompete Agreements [Member] Technology Technology Based Intangible Assets [Member] Finite-Lived Intangible Assets [Line Items] Finite Lived Intangible Assets [Line Items] Finite Lived Intangible Assets Gross Finite Lived Intangible Assets Gross Finite Lived Intangible Assets Accumulated Amortization Finite Lived Intangible Assets Accumulated Amortization Intangibles, net Fiscal Year Finite Lived Intangible Assets Future Amortization Expense [Abstract] Remaining 2019 Finite Lived Intangible Assets Amortization Expense Next Twelve Months 2020 Finite Lived Intangible Assets Amortization Expense Year Two 2021 Finite Lived Intangible Assets Amortization Expense Year Three 2022 Finite Lived Intangible Assets Amortization Expense Year Four 2023 Finite Lived Intangible Assets Amortization Expense Year Five Thereafter Finite Lived Intangible Assets Amortization Expense After Year Five Total amortization expense Finite Lived Intangible Assets Net Weighted average number of years of amortization expense Acquired Finite Lived Intangible Assets Weighted Average Useful Life Investment [Table] Investment [Table] Cash and Cash Equivalents Cash And Cash Equivalents [Axis] Cash and Cash Equivalents Restricted Cash And Cash Equivalents Cash And Cash Equivalents [Member] Certificate of Deposits Certificates Of Deposit [Member] Investment [Line Items] Investment [Line Items] Investment, less than twelve months Restricted Cash And Cash Equivalents At Carrying Value Investments Investments The approximate term of the warranty, Product Warranty Liability [Table] Product Warranty Liability [Table] Product Warranty Liability [Line Items] Product Warranty Liability [Line Items] Warranty term Warranty Term Warranty reserves. Warranty reserves Warranty Reserves Rent expense under operating leases Operating Leases Rent Expense Net Fiscal Year Operating Leases Future Minimum Payments Due [Abstract] Remaining 2019 Operating Leases Future Minimum Payments Due Current 2020 Operating Leases Future Minimum Payments Due In Two Years 2021 Operating Leases Future Minimum Payments Due In Three Years 2022 Operating Leases Future Minimum Payments Due In Four Years 2023 Operating Leases Future Minimum Payments Due In Five Years Thereafter Operating Leases Future Minimum Payments Due Thereafter Income tax provision Effective income tax rate Effective Income Tax Rate Continuing Operations U.S. statutory tax rate Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate Deferred tax liability, undistributed foreign earnings Deferred Tax Liabilities Undistributed Foreign Earnings Foreign earnings Foreign Earnings Repatriated Liability for uncertain tax positions related to continuing operations, excluding interest and penalties Liability For Uncertain Tax Positions Noncurrent Liability for uncertain tax provisions Income Tax Examination Liability Refund Adjustment From Settlement With Taxing Authority Deferred tax valuation allowance Deferred Tax Assets Valuation Allowance Additional deferred tax assets State and Local Deferred Tax Assets Operating Loss Carryforwards State And Local The number of votes per share. The percentage rate of Class A dividends as computed for Class B dividend limitation. Schedule of earning per share. Schedule of earning per share. Schedule Of Earning Per Share [Table] Schedule Of Earning Per Share [Table] Schedule Of Earning Per Share [Line Items] Schedule Of Earning Per Share [Line Items] Common stock shares, authorized Common Stock Shares Authorized Number of votes per share Number Of Votes Per Share Limit of cash dividends Class B common stock (percent) Limit Of Cash Dividends Class B Common Stock Numerator for Basic and Diluted Earnings Per Share: Denominator for Basic and Diluted Earnings Per Share: Income from continuing operations per share. Income from discontinued operations per share. Schedule Of Earnings Per Share Basic By Common Class [Table] Schedule Of Earnings Per Share Basic By Common Class [Table] Earnings type. Earnings Type Earnings Type [Axis] Earnings type. Earnings Type Earnings Type [Domain] Basic. Basic Basic [Member] Operating Activities Statement Operating Activities Segment [Axis] Operating Activities Segment Operating Activities [Domain] Continuing Operations Segment Continuing Operations [Member] Discontinued Operations Segment Discontinued Operations [Member] Diluted. Diluted Diluted [Member] Earnings Per Share Basic [Line Items] Earnings Per Share Basic [Line Items] Numerator for Basic and Diluted Earnings Per Share: Numerator For Basic And Diluted Earnings Per Share [Abstract] Net (loss) income from continuing operations Less dividends Dividends Undistributed losses - continuing operations, Basic Undistributed Continuing Operation Earnings Loss Basic Undistributed earnings (losses) - discontinued operations, Basic Undistributed Discontinued Operation Earnings Loss Basic Undistributed (losses) earnings, Basic Undistributed Earnings Denominator for basic and diluted Earnings Per Share: Denominator For Basic And Diluted Earnings Per Share [Abstract] Weighted Average Number of Shares Outstanding, Basic Effect of dilutive securities dilutive stock options Incremental Common Shares Attributable To Share Based Payment Arrangements Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number Diluted Shares Outstanding Adjustment Net (loss) income from continuing operations per share: Income From Continuing Operations Per Share [Abstract] (Loss) income from continuing operations, Basic (Loss) income from continuing operations, Diluted Income from discontinued operations per share: Income From Discontinued Operations Per Share [Abstract] Income from discontinued operations, Basic Income from discontinued operations, Diluted Net (loss) income per share: Earnings Per Share Basic And Diluted [Abstract] Earnings Per Share, Basic Undistributed losses - continuing operations, Diluted Undistributed Continuing Operation Earnings Loss Diluted Undistributed earnings (losses) - discontinued operations, Diluted Undistributed Discontinued Operation Earnings Loss Diluted Undistributed (losses) earnings, Diluted Undistributed Earnings Diluted Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number Of Share Outstanding Basic And Diluted Earnings Per Share, Diluted Common stock options anti-dilutive Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Schedule Of Segment Reporting Information By Segment [Table] Schedule Of Segment Reporting Information By Segment [Table] Segments Statement Business Segments [Axis] Segments Segment [Domain] Power and microwave technologies group. PMT Power And Microwave Technologies Group [Member] Canvys. Canvys Canvys [Member] Healthcare segment. Healthcare Healthcare Segment [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Net Sales Gross Profit Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] North America North America [Member] Asia/Pacific Asia Pacific [Member] Europe Europe [Member] Latin America Latin America [Member] Unallocated other. Other Unallocated Other [Member] Bank Time Deposits, Fair Value Disclosure Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy and NAV Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 1 Fair Value Inputs Level1 [Member] Measurement Frequency Fair Value By Measurement Frequency [Axis] Fair Value, Measurement Frequency Fair Value Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value Measurements Recurring [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] CDs Bank Time Deposits Fair Value Disclosure Related Party Transaction Related Party Transaction [Axis] Related Party Transaction Related Party Transaction [Domain] Lease agreement. Lessor - LDL, LLC Lease Agreement [Member] Related Party Related Party Transactions By Related Party [Axis] Related Party Related Party [Domain] Lee A. McIntyre III Management [Member] Total future minimum lease payments Operating Leases Future Minimum Payments Due Lease term Lessor Operating Lease Term Of Contract Renewal term Lessor Operating Lease Renewal Term Rental expense