3.19.1 html 464 447 1 true 172 0 false 5 false false R1.htm 000 - Document - Document And Entity Information Sheet http://www.cuiglobal.com/20181231/role/statement-document-and-entity-information Document And Entity Information Cover 1 false false R2.htm 001 - Statement - Consolidated Balance Sheets Sheet http://www.cuiglobal.com/20181231/role/statement-consolidated-balance-sheets- Consolidated Balance Sheets Statements 2 false false R3.htm 002 - Statement - Consolidated Balance Sheets (Parentheticals) Sheet http://www.cuiglobal.com/20181231/role/statement-consolidated-balance-sheets-parentheticals Consolidated Balance Sheets (Parentheticals) Statements 3 false false R4.htm 003 - Statement - Consolidated Statements of Operations Sheet http://www.cuiglobal.com/20181231/role/statement-consolidated-statements-of-operations- Consolidated Statements of Operations Statements 4 false false R5.htm 004 - Statement - Consolidated Statements of Comprehensive Income and (Loss) Sheet http://www.cuiglobal.com/20181231/role/statement-consolidated-statements-of-comprehensive-income-and-loss Consolidated Statements of Comprehensive Income and (Loss) Statements 5 false false R6.htm 005 - Statement - Consolidated Statements of Changes in Stockholders' Equity Sheet http://www.cuiglobal.com/20181231/role/statement-consolidated-statements-of-changes-in-stockholders-equity- Consolidated Statements of Changes in Stockholders' Equity Statements 6 false false R7.htm 006 - Statement - Consolidated Statements of Cash Flows Sheet http://www.cuiglobal.com/20181231/role/statement-consolidated-statements-of-cash-flows- Consolidated Statements of Cash Flows Statements 7 false false R8.htm 007 - Disclosure - Note 1 - Nature of Operations, Basis of Presentation and Company Conditions Sheet http://www.cuiglobal.com/20181231/role/statement-note-1-nature-of-operations-basis-of-presentation-and-company-conditions Note 1 - Nature of Operations, Basis of Presentation and Company Conditions Notes 8 false false R9.htm 008 - Disclosure - Note 2 - Summary of Significant Accounting Policies Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies Note 2 - Summary of Significant Accounting Policies Notes 9 false false R10.htm 009 - Disclosure - Note 3 - Investments and Fair Value Measurements Sheet http://www.cuiglobal.com/20181231/role/statement-note-3-investments-and-fair-value-measurements Note 3 - Investments and Fair Value Measurements Notes 10 false false R11.htm 010 - Disclosure - Note 4 - Property and Equipment, Net Sheet http://www.cuiglobal.com/20181231/role/statement-note-4-property-and-equipment-net Note 4 - Property and Equipment, Net Notes 11 false false R12.htm 011 - Disclosure - Note 5 - Goodwill and Other Intangible Assets Sheet http://www.cuiglobal.com/20181231/role/statement-note-5-goodwill-and-other-intangible-assets Note 5 - Goodwill and Other Intangible Assets Notes 12 false false R13.htm 012 - Disclosure - Note 6 - Instruments and Risk Management Sheet http://www.cuiglobal.com/20181231/role/statement-note-6-instruments-and-risk-management Note 6 - Instruments and Risk Management Notes 13 false false R14.htm 013 - Disclosure - Note 7 - Notes Payable Notes http://www.cuiglobal.com/20181231/role/statement-note-7-notes-payable Note 7 - Notes Payable Notes 14 false false R15.htm 014 - Disclosure - Note 8 - Working Capital Line of Credit and Overdraft Facility Sheet http://www.cuiglobal.com/20181231/role/statement-note-8-working-capital-line-of-credit-and-overdraft-facility Note 8 - Working Capital Line of Credit and Overdraft Facility Notes 15 false false R16.htm 015 - Disclosure - Note 9 - Commitments and Contingencies Sheet http://www.cuiglobal.com/20181231/role/statement-note-9-commitments-and-contingencies Note 9 - Commitments and Contingencies Notes 16 false false R17.htm 016 - Disclosure - Note 10 - Stockholders' Equity Sheet http://www.cuiglobal.com/20181231/role/statement-note-10-stockholders-equity Note 10 - Stockholders' Equity Notes 17 false false R18.htm 017 - Disclosure - Note 11 - Related Party Transactions Sheet http://www.cuiglobal.com/20181231/role/statement-note-11-related-party-transactions Note 11 - Related Party Transactions Notes 18 false false R19.htm 018 - Disclosure - Note 12 - Accumulated Other Comprehensive Income (Loss) Sheet http://www.cuiglobal.com/20181231/role/statement-note-12-accumulated-other-comprehensive-income-loss Note 12 - Accumulated Other Comprehensive Income (Loss) Notes 19 false false R20.htm 019 - Disclosure - Note 13 - Capitalized Interest Sheet http://www.cuiglobal.com/20181231/role/statement-note-13-capitalized-interest Note 13 - Capitalized Interest Notes 20 false false R21.htm 020 - Disclosure - Note 14 - Income Taxes Sheet http://www.cuiglobal.com/20181231/role/statement-note-14-income-taxes Note 14 - Income Taxes Notes 21 false false R22.htm 021 - Disclosure - Note 15 - Concentrations Sheet http://www.cuiglobal.com/20181231/role/statement-note-15-concentrations Note 15 - Concentrations Notes 22 false false R23.htm 022 - Disclosure - Note 16 - Subsequent Events Sheet http://www.cuiglobal.com/20181231/role/statement-note-16-subsequent-events Note 16 - Subsequent Events Notes 23 false false R24.htm 023 - Disclosure - Significant Accounting Policies (Policies) Sheet http://www.cuiglobal.com/20181231/role/statement-significant-accounting-policies-policies Significant Accounting Policies (Policies) Policies http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies 24 false false R25.htm 024 - Disclosure - Note 2 - Summary of Significant Accounting Policies (Tables) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-tables Note 2 - Summary of Significant Accounting Policies (Tables) Tables http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies 25 false false R26.htm 025 - Disclosure - Note 3 - Investments and Fair Value Measurements (Tables) Sheet http://www.cuiglobal.com/20181231/role/statement-note-3-investments-and-fair-value-measurements-tables Note 3 - Investments and Fair Value Measurements (Tables) Tables http://www.cuiglobal.com/20181231/role/statement-note-3-investments-and-fair-value-measurements 26 false false R27.htm 026 - Disclosure - Note 4 - Property and Equipment, Net (Tables) Sheet http://www.cuiglobal.com/20181231/role/statement-note-4-property-and-equipment-net-tables Note 4 - Property and Equipment, Net (Tables) Tables http://www.cuiglobal.com/20181231/role/statement-note-4-property-and-equipment-net 27 false false R28.htm 027 - Disclosure - Note 5 - Goodwill and Other Intangible Assets (Tables) Sheet http://www.cuiglobal.com/20181231/role/statement-note-5-goodwill-and-other-intangible-assets-tables Note 5 - Goodwill and Other Intangible Assets (Tables) Tables http://www.cuiglobal.com/20181231/role/statement-note-5-goodwill-and-other-intangible-assets 28 false false R29.htm 028 - Disclosure - Note 6 - Instruments and Risk Management (Tables) Sheet http://www.cuiglobal.com/20181231/role/statement-note-6-instruments-and-risk-management-tables Note 6 - Instruments and Risk Management (Tables) Tables http://www.cuiglobal.com/20181231/role/statement-note-6-instruments-and-risk-management 29 false false R30.htm 029 - Disclosure - Note 7 - Notes Payable (Tables) Notes http://www.cuiglobal.com/20181231/role/statement-note-7-notes-payable-tables Note 7 - Notes Payable (Tables) Tables http://www.cuiglobal.com/20181231/role/statement-note-7-notes-payable 30 false false R31.htm 030 - Disclosure - Note 8 - Working Capital Line of Credit and Overdraft Facility (Tables) Sheet http://www.cuiglobal.com/20181231/role/statement-note-8-working-capital-line-of-credit-and-overdraft-facility-tables Note 8 - Working Capital Line of Credit and Overdraft Facility (Tables) Tables http://www.cuiglobal.com/20181231/role/statement-note-8-working-capital-line-of-credit-and-overdraft-facility 31 false false R32.htm 031 - Disclosure - Note 9 - Commitments and Contingencies (Tables) Sheet http://www.cuiglobal.com/20181231/role/statement-note-9-commitments-and-contingencies-tables Note 9 - Commitments and Contingencies (Tables) Tables http://www.cuiglobal.com/20181231/role/statement-note-9-commitments-and-contingencies 32 false false R33.htm 032 - Disclosure - Note 10 - Stockholders' Equity (Tables) Sheet http://www.cuiglobal.com/20181231/role/statement-note-10-stockholders-equity-tables Note 10 - Stockholders' Equity (Tables) Tables http://www.cuiglobal.com/20181231/role/statement-note-10-stockholders-equity 33 false false R34.htm 033 - Disclosure - Note 12 - Accumulated Other Comprehensive Income (Loss) (Tables) Sheet http://www.cuiglobal.com/20181231/role/statement-note-12-accumulated-other-comprehensive-income-loss-tables Note 12 - Accumulated Other Comprehensive Income (Loss) (Tables) Tables http://www.cuiglobal.com/20181231/role/statement-note-12-accumulated-other-comprehensive-income-loss 34 false false R35.htm 034 - Disclosure - Note 13 - Capitalized Interest (Tables) Sheet http://www.cuiglobal.com/20181231/role/statement-note-13-capitalized-interest-tables Note 13 - Capitalized Interest (Tables) Tables http://www.cuiglobal.com/20181231/role/statement-note-13-capitalized-interest 35 false false R36.htm 035 - Disclosure - Note 14 - Income Taxes (Tables) Sheet http://www.cuiglobal.com/20181231/role/statement-note-14-income-taxes-tables Note 14 - Income Taxes (Tables) Tables http://www.cuiglobal.com/20181231/role/statement-note-14-income-taxes 36 false false R37.htm 036 - Disclosure - Note 1 - Nature of Operations, Basis of Presentation and Company Conditions (Details Textual) Sheet http://www.cuiglobal.com/20181231/role/statement-note-1-nature-of-operations-basis-of-presentation-and-company-conditions-details-textual Note 1 - Nature of Operations, Basis of Presentation and Company Conditions (Details Textual) Details http://www.cuiglobal.com/20181231/role/statement-note-1-nature-of-operations-basis-of-presentation-and-company-conditions 37 false false R38.htm 037 - Disclosure - Note 2 - Summary of Significant Accounting Policies (Details Textual) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-details-textual Note 2 - Summary of Significant Accounting Policies (Details Textual) Details http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-tables 38 false false R39.htm 038 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-allowance-for-doubtful-accounts-details Note 2 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) Details 39 false false R40.htm 039 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Inventory (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-inventory-details Note 2 - Summary of Significant Accounting Policies - Inventory (Details) Details http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-tables 40 false false R41.htm 040 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Inventory Reserves (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-inventory-reserves-details Note 2 - Summary of Significant Accounting Policies - Inventory Reserves (Details) Details 41 false false R42.htm 041 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Estimated Useful Lives for Buildings, Improvements, Furniture, Vehicles, and Equipment (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-estimated-useful-lives-for-buildings-improvements-furniture-vehicles-and-equipment-details Note 2 - Summary of Significant Accounting Policies - Estimated Useful Lives for Buildings, Improvements, Furniture, Vehicles, and Equipment (Details) Details 42 false false R43.htm 042 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Estimated Useful Life for the Intangible Assets (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-estimated-useful-life-for-the-intangible-assets-details Note 2 - Summary of Significant Accounting Policies - Estimated Useful Life for the Intangible Assets (Details) Details 43 false false R44.htm 043 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Cumulative Effect of Adjustments for New Accounting Pronouncements on Consolidated Balance Sheet (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-cumulative-effect-of-adjustments-for-new-accounting-pronouncements-on-consolidated-balance-sheet-details Note 2 - Summary of Significant Accounting Policies - Cumulative Effect of Adjustments for New Accounting Pronouncements on Consolidated Balance Sheet (Details) Details 44 false false R45.htm 044 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Impact of New Standard on Condensed Consolidated Balance Sheet and Condensed Consolidated Statements of Operations (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-impact-of-new-standard-on-condensed-consolidated-balance-sheet-and-condensed-consolidated-statements-of-operations-details Note 2 - Summary of Significant Accounting Policies - Impact of New Standard on Condensed Consolidated Balance Sheet and Condensed Consolidated Statements of Operations (Details) Details 45 false false R46.htm 045 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Contract Liabilities (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-contract-liabilities-details Note 2 - Summary of Significant Accounting Policies - Contract Liabilities (Details) Details 46 false false R47.htm 046 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Revenues Disaggregated (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-revenues-disaggregated-details Note 2 - Summary of Significant Accounting Policies - Revenues Disaggregated (Details) Details 47 false false R48.htm 047 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Summary of Potential Common Stock Shares (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-summary-of-potential-common-stock-shares-details Note 2 - Summary of Significant Accounting Policies - Summary of Potential Common Stock Shares (Details) Details 48 false false R49.htm 048 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Calculation of Basic and Diluted Earnings Per Share (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-calculation-of-basic-and-diluted-earnings-per-share-details Note 2 - Summary of Significant Accounting Policies - Calculation of Basic and Diluted Earnings Per Share (Details) Details 49 false false R50.htm 049 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Summary of Segment Activity (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-summary-of-segment-activity-details Note 2 - Summary of Significant Accounting Policies - Summary of Segment Activity (Details) Details 50 false false R51.htm 050 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Revenue By Country (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-revenue-by-country-details Note 2 - Summary of Significant Accounting Policies - Revenue By Country (Details) Details 51 false false R52.htm 051 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Long-lived Assets By Country (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies-longlived-assets-by-country-details Note 2 - Summary of Significant Accounting Policies - Long-lived Assets By Country (Details) Details 52 false false R53.htm 052 - Disclosure - Note 3 - Investments and Fair Value Measurements (Details Textual) Sheet http://www.cuiglobal.com/20181231/role/statement-note-3-investments-and-fair-value-measurements-details-textual Note 3 - Investments and Fair Value Measurements (Details Textual) Details http://www.cuiglobal.com/20181231/role/statement-note-3-investments-and-fair-value-measurements-tables 53 false false R54.htm 053 - Disclosure - Note 3 - Investments and Fair Value Measurements - Fair Value Hierarchy for Cash Equivalents and Marketable Securities (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-3-investments-and-fair-value-measurements-fair-value-hierarchy-for-cash-equivalents-and-marketable-securities-details Note 3 - Investments and Fair Value Measurements - Fair Value Hierarchy for Cash Equivalents and Marketable Securities (Details) Details 54 false false R55.htm 054 - Disclosure - Note 3 - Investments and Fair Value Measurements - Contingent Consideration (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-3-investments-and-fair-value-measurements-contingent-consideration-details Note 3 - Investments and Fair Value Measurements - Contingent Consideration (Details) Details 55 false false R56.htm 055 - Disclosure - Note 4 - Property and Equipment, Net (Details Textual) Sheet http://www.cuiglobal.com/20181231/role/statement-note-4-property-and-equipment-net-details-textual Note 4 - Property and Equipment, Net (Details Textual) Details http://www.cuiglobal.com/20181231/role/statement-note-4-property-and-equipment-net-tables 56 false false R57.htm 056 - Disclosure - Note 4 - Property and Equipment, Net - Property and Equipment (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-4-property-and-equipment-net-property-and-equipment-details Note 4 - Property and Equipment, Net - Property and Equipment (Details) Details 57 false false R58.htm 057 - Disclosure - Note 5 - Goodwill and Other Intangible Assets (Details Textual) Sheet http://www.cuiglobal.com/20181231/role/statement-note-5-goodwill-and-other-intangible-assets-details-textual Note 5 - Goodwill and Other Intangible Assets (Details Textual) Details http://www.cuiglobal.com/20181231/role/statement-note-5-goodwill-and-other-intangible-assets-tables 58 false false R59.htm 058 - Disclosure - Note 5 - Goodwill and Other Intangible Assets - Intangible Assets (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-5-goodwill-and-other-intangible-assets-intangible-assets-details Note 5 - Goodwill and Other Intangible Assets - Intangible Assets (Details) Details 59 false false R60.htm 059 - Disclosure - Note 5 - Goodwill and Other Intangible Assets - Amortization (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-5-goodwill-and-other-intangible-assets-amortization-details Note 5 - Goodwill and Other Intangible Assets - Amortization (Details) Details 60 false false R61.htm 060 - Disclosure - Note 5 - Goodwill and Other Intangible Assets - Estimated Future Amortization (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-5-goodwill-and-other-intangible-assets-estimated-future-amortization-details Note 5 - Goodwill and Other Intangible Assets - Estimated Future Amortization (Details) Details 61 false false R62.htm 061 - Disclosure - Note 5 - Goodwill and Indefinite-lived Intangibles - Goodwill (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-5-goodwill-and-indefinitelived-intangibles-goodwill-details Note 5 - Goodwill and Indefinite-lived Intangibles - Goodwill (Details) Details 62 false false R63.htm 062 - Disclosure - Note 6 - Instruments and Risk Management (Details Textual) Sheet http://www.cuiglobal.com/20181231/role/statement-note-6-instruments-and-risk-management-details-textual Note 6 - Instruments and Risk Management (Details Textual) Details http://www.cuiglobal.com/20181231/role/statement-note-6-instruments-and-risk-management-tables 63 false false R64.htm 063 - Disclosure - Note 6 - Instruments and Risk Management - Foreign Exchange Contracts Statement of Financial Position (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-6-instruments-and-risk-management-foreign-exchange-contracts-statement-of-financial-position-details Note 6 - Instruments and Risk Management - Foreign Exchange Contracts Statement of Financial Position (Details) Details 64 false false R65.htm 064 - Disclosure - Note 7 - Notes Payable (Details Textual) Notes http://www.cuiglobal.com/20181231/role/statement-note-7-notes-payable-details-textual Note 7 - Notes Payable (Details Textual) Details http://www.cuiglobal.com/20181231/role/statement-note-7-notes-payable-tables 65 false false R66.htm 065 - Disclosure - Note 7 - Notes Payable - Summary of Notes Payable (Details) Notes http://www.cuiglobal.com/20181231/role/statement-note-7-notes-payable-summary-of-notes-payable-details Note 7 - Notes Payable - Summary of Notes Payable (Details) Details 66 false false R67.htm 066 - Disclosure - Note 7 - Notes Payable - Maturity of Notes Payable (Details) Notes http://www.cuiglobal.com/20181231/role/statement-note-7-notes-payable-maturity-of-notes-payable-details Note 7 - Notes Payable - Maturity of Notes Payable (Details) Details 67 false false R68.htm 067 - Disclosure - Note 8 - Working Capital Line of Credit and Overdraft Facility (Details Textual) Sheet http://www.cuiglobal.com/20181231/role/statement-note-8-working-capital-line-of-credit-and-overdraft-facility-details-textual Note 8 - Working Capital Line of Credit and Overdraft Facility (Details Textual) Details http://www.cuiglobal.com/20181231/role/statement-note-8-working-capital-line-of-credit-and-overdraft-facility-tables 68 false false R69.htm 068 - Disclosure - Note 8 - Overdraft Facility and Working Capital Line of Credit - Revolving Line of Credit (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-8-overdraft-facility-and-working-capital-line-of-credit-revolving-line-of-credit-details Note 8 - Overdraft Facility and Working Capital Line of Credit - Revolving Line of Credit (Details) Details 69 false false R70.htm 069 - Disclosure - Note 9 - Commitments and Contingencies (Details Textual) Sheet http://www.cuiglobal.com/20181231/role/statement-note-9-commitments-and-contingencies-details-textual Note 9 - Commitments and Contingencies (Details Textual) Details http://www.cuiglobal.com/20181231/role/statement-note-9-commitments-and-contingencies-tables 70 false false R71.htm 070 - Disclosure - Note 9 - Commitments and Contingencies - Operating Leases (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-9-commitments-and-contingencies-operating-leases-details Note 9 - Commitments and Contingencies - Operating Leases (Details) Details 71 false false R72.htm 071 - Disclosure - Note 10 - Stockholders' Equity (Details Textual) Sheet http://www.cuiglobal.com/20181231/role/statement-note-10-stockholders-equity-details-textual Note 10 - Stockholders' Equity (Details Textual) Details http://www.cuiglobal.com/20181231/role/statement-note-10-stockholders-equity-tables 72 false false R73.htm 072 - Disclosure - Note 10 - Stockholders' Equity - Common Stock Issuances (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-10-stockholders-equity-common-stock-issuances-details Note 10 - Stockholders' Equity - Common Stock Issuances (Details) Details 73 false false R74.htm 073 - Disclosure - Note 10 - Stockholders' Equity - Summary of Warrants and Options Issued to Employees and Directors (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-10-stockholders-equity-summary-of-warrants-and-options-issued-to-employees-and-directors-details Note 10 - Stockholders' Equity - Summary of Warrants and Options Issued to Employees and Directors (Details) Details 74 false false R75.htm 074 - Disclosure - Note 11 - Related Party Transactions (Details Textual) Sheet http://www.cuiglobal.com/20181231/role/statement-note-11-related-party-transactions-details-textual Note 11 - Related Party Transactions (Details Textual) Details http://www.cuiglobal.com/20181231/role/statement-note-11-related-party-transactions 75 false false R76.htm 075 - Disclosure - Note 12 - Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-12-accumulated-other-comprehensive-income-loss-components-of-accumulated-other-comprehensive-loss-details Note 12 - Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Details) Details http://www.cuiglobal.com/20181231/role/statement-note-12-accumulated-other-comprehensive-income-loss-tables 76 false false R77.htm 076 - Disclosure - Note 13 - Capitalized Interest - Components of Interest Expense and Capitalized Interest (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-13-capitalized-interest-components-of-interest-expense-and-capitalized-interest-details Note 13 - Capitalized Interest - Components of Interest Expense and Capitalized Interest (Details) Details 77 false false R78.htm 077 - Disclosure - Note 14 - Income Taxes (Details Textual) Sheet http://www.cuiglobal.com/20181231/role/statement-note-14-income-taxes-details-textual Note 14 - Income Taxes (Details Textual) Details http://www.cuiglobal.com/20181231/role/statement-note-14-income-taxes-tables 78 false false R79.htm 078 - Disclosure - Note 14 - Income Taxes - Consolidated Income From Continuing Operations Before Income Taxes (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-14-income-taxes-consolidated-income-from-continuing-operations-before-income-taxes-details Note 14 - Income Taxes - Consolidated Income From Continuing Operations Before Income Taxes (Details) Details 79 false false R80.htm 079 - Disclosure - Note 14 - Income Taxes - Income Tax Provision (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-14-income-taxes-income-tax-provision-details Note 14 - Income Taxes - Income Tax Provision (Details) Details 80 false false R81.htm 080 - Disclosure - Note 14 - Income Taxes - Reconciliation of the Federal Statutory Tax Rate to the Recorded Tax Provision (benefit) (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-14-income-taxes-reconciliation-of-the-federal-statutory-tax-rate-to-the-recorded-tax-provision-benefit-details Note 14 - Income Taxes - Reconciliation of the Federal Statutory Tax Rate to the Recorded Tax Provision (benefit) (Details) Details 81 false false R82.htm 081 - Disclosure - Note 14 - Income Taxes - Significant Portions of Deferred Tax Assets and Liabilities (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-14-income-taxes-significant-portions-of-deferred-tax-assets-and-liabilities-details Note 14 - Income Taxes - Significant Portions of Deferred Tax Assets and Liabilities (Details) Details 82 false false R83.htm 082 - Disclosure - Note 14 - Income Taxes - Net Deferred Tax Liability (Details) Sheet http://www.cuiglobal.com/20181231/role/statement-note-14-income-taxes-net-deferred-tax-liability-details Note 14 - Income Taxes - Net Deferred Tax Liability (Details) Details 83 false false R84.htm 083 - Disclosure - Note 15 - Concentrations (Details Textual) Sheet http://www.cuiglobal.com/20181231/role/statement-note-15-concentrations-details-textual Note 15 - Concentrations (Details Textual) Details http://www.cuiglobal.com/20181231/role/statement-note-15-concentrations 84 false false R85.htm 084 - Disclosure - Note 16 - Subsequent Events (Details Textual) Sheet http://www.cuiglobal.com/20181231/role/statement-note-16-subsequent-events-details-textual Note 16 - Subsequent Events (Details Textual) Details http://www.cuiglobal.com/20181231/role/statement-note-16-subsequent-events 85 false false All Reports Book All Reports cui-20181231.xml cui-20181231.xsd cui-20181231_cal.xml cui-20181231_def.xml cui-20181231_lab.xml cui-20181231_pre.xml http://fasb.org/us-gaap/2018-01-31 http://xbrl.sec.gov/country/2017-01-31 http://xbrl.sec.gov/dei/2018-01-31 http://fasb.org/srt/2018-01-31 true true