Document And Entity Information
Note To Financial Statement Details Textual
Significant Accounting Policies
Note 4 - Net Income Per Share
2021
Note 5 - Fair Value of Financial Instruments
Total
Note 6 - Inventories
Less than 1 year
Note 9 - Leases
Note 4 - Net Income Per Share - Components of Common Shares Outstanding (Details)
Note 5 - Fair Value of Financial Instruments - Fair Value of Available-for-sale Securities (Details)
Note 5 - Fair Value of Financial Instruments - Assets Measured on Recurring Basis (Details)
Note 5 - Fair Value of Financial Instruments - Reconciliation of Available-for-sale Securities (Details)
Income Tax Disclosure [Text Block]
Note 5 - Fair Value of Financial Instruments - Investment Securities With Unrealized Losses (Details)
Note 6 - Inventories - Summary of Inventories (Details)
Unrealized gain on marketable securities, net of tax
Unrealized gain from marketable securities, net of tax
Note 9 - Leases - Operating Lease (Details)
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Note 9 - Leases - Maturities of Lease Liabilities (Details)
us-gaap_ShareBasedCompensation
Stock-based compensation
us-gaap_LiabilitiesCurrent
Total current liabilities
2020
Notes To Financial Statements
Notes To Financial Statements [Abstract]
us-gaap_Revenues
Revenue
nvec_AvailableForSaleDebtSecuritiesRemainingMaturity
Available for Sale Debt Securities, Remaining Maturity
The remaining maturity of available for sale debt securities.
nvec_AvailableForSaleDebtSecurititesPercentOfTotalAssets
Available for Sale Debt Securitites, Percent of Total Assets
The amount of available for sale debt securities as a percentage of total assets.
us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Gross unrealized losses, 12 months or greater
Proceeds from maturities of marketable securities
us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
Total gross unrealized losses
us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Gross unrealized losses, less than 12 months
Marketable securities, long-term
Depreciation and amortization
us-gaap_AssetsCurrent
Total current assets
Total fair market value
Balance
Balance
Balance
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block]
Fair market value, less than 12 months
Fair market value, 12 months or greater
Discount rate
Represents discount rate of operating lease.
Remaining lease term (Year)
Remaining term of lessee's operating lease.
Common stock, $0.01 par value, 6,000,000 shares authorized; 4,846,010 issued and outstanding as of December 31, 2019 and March 31, 2019
us-gaap_PaymentsToAcquireMarketableSecurities
Purchases of marketable securities
Adjustments to reconcile net income to net cash provided by operating activities:
Measurement Frequency [Axis]
Measurement Frequency [Domain]
Fair Value, Recurring [Member]
Common stock, shares authorized (in shares)
Common stock, shares issued (in shares)
Common stock, par value (in dollars per share)
Revenue from Contract with Customer [Policy Text Block]
nvec_NumberOfOtherThanTemporarilyImpairedMarketableSecurities
Number of Other-than-temporarily Impaired Marketable Securities
Represents the number of marketable securities the company considers other-than-temporarily impaired.
Accrued payroll and other
Statistical Measurement [Domain]
Operating cash flows for leases
Maximum [Member]
Lessee, Operating Leases [Text Block]
Minimum [Member]
Accounts payable
Product and Service [Axis]
Product and Service [Domain]
Statistical Measurement [Axis]
us-gaap_PolicyTextBlockAbstract
Accounting Policies
Cash paid during the period for income taxes
Inventories
Total inventories
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of fixed assets
Dilutive effect of stock options (in shares)
Fair Value Hierarchy and NAV [Domain]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value Hierarchy and NAV [Axis]
LIABILITIES AND SHAREHOLDERS’ EQUITY
Product [Member]
us-gaap_Assets
Total assets
OPERATING ACTIVITIES
Statement [Line Items]
Allowance for uncollectible accounts
Accounts receivable, net of allowance for uncollectible accounts of $15,000
Share-based Payment Arrangement [Text Block]
Marketable securities, short-term
Additional paid-in capital
AOCI Attributable to Parent [Member]
Shareholders’ equity
Stock Repurchase Plan Disclosure [Text Block]
The entire disclosure for the stock repurchase plan.
Business Description and Basis of Presentation [Text Block]
Fair Value Disclosures [Text Block]
Basis of Presentation and Significant Accounting Policies [Text Block]
Net income
Net income
1-3 years
Fair value of available-for-sale debt securities maturing in one to three years.
ASSETS
Interest income
us-gaap_NetCashProvidedByUsedInFinancingActivities
Cash used in financing activities
us-gaap_OperatingIncomeLoss
Income from operations
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash provided by operating activities
Prepaid expenses and other assets
us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash provided by investing activities
us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Increase in cash and cash equivalents
Cost of sales
us-gaap_GrossProfit
Gross profit
3-5 years
Fair value of available-for-sale debt securities maturing after three through five years.
Less accumulated depreciation and amortization
us-gaap_PropertyPlantAndEquipmentNet
Net fixed assets
Machinery and equipment
Leasehold improvements
Fixed assets
us-gaap_PaymentsOfDividendsCommonStock
Payment of dividends to shareholders
Total comprehensive income
Comprehensive income
INVESTING ACTIVITIES
Securities available for sale
Estimated Fair Value
Retained Earnings [Member]
Earnings Per Share [Text Block]
Title of Individual [Domain]
Proceeds from sale of common stock
Title of Individual [Axis]
us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Stock Repurchase Program, Remaining Authorized Repurchase Amount
Additional Paid-in Capital [Member]
Share Repurchase Program [Domain]
Common Stock [Member]
us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock Repurchase Program, Authorized Amount
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income before taxes
Provision for income taxes
Equity Components [Axis]
Equity Component [Domain]
Share Repurchase Program [Axis]
us-gaap_OperatingExpenses
Total expenses
us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent
us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay
Cash and cash equivalents
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
Non-employee Director Stock Options [Member]
An arrangement whereby a non-employee director is issued automatic stock options on their election or reelection to the company's Board.
us-gaap_AllocatedShareBasedCompensationExpense
Share-based Payment Arrangement, Expense
us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit
us-gaap_DefinedBenefitPlanContributionsByEmployer
Defined Benefit Plan, Plan Assets, Contributions by Employer
nvec_StockRepurchaseProgramAuthorizedAdditionalAmount
Stock Repurchase Program Authorized Additional Amount
Amount of additional stock repurchase plan authorized.
Amendment Flag
us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits, Ending Balance
Accounting Policies [Abstract]
us-gaap_OpenTaxYear
Open Tax Year
Basis of Accounting, Policy [Policy Text Block]
Cash dividends declared per common share (in dollars per share)
Common Stock, Dividends, Per Share, Declared
Accounts payable and other liabilities
us-gaap_CommonStockDividendsPerShareCashPaid
Cash dividends declared per common share (in dollars per share)
Cumulative effect of accounting change
us-gaap_SharesOutstanding
Balance (in shares)
Balance (in shares)
Common stock, shares outstanding (in shares)
Title of 12(b) Security
us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
Unrecognized Tax Benefits, Interest on Income Taxes Accrued
Current Fiscal Year End Date
Variable lease cost
us-gaap_LeaseCost
Total
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid expenses and other assets
nvec_NumberOfOtherThanTemporarilyImpairedAvailableForsaleSecurities
Number of Other-than-temporarily Impaired Available-for-sale Securities
Represents number of other-than-temporarily impaired available-for-sale securities.
Document Fiscal Period Focus
Operating lease cost
Document Fiscal Year Focus
Lease, Cost [Table Text Block]
Document Period End Date
Entity Emerging Growth Company
Document Type
Entity Small Business
Entity Shell Company
us-gaap_DividendsCommonStockCash
Cash dividends declared
Document Information [Line Items]
Document Information [Table]
Entity Filer Category
Entity Current Reporting Status
Diluted (in shares)
Shares used in computing net income per share – diluted (in shares)
us-gaap_IncreaseDecreaseInAccountsReceivable
Accounts receivable
Stock-based compensation
Statement of Comprehensive Income [Abstract]
Entity Central Index Key
Entity Registrant Name
Entity [Domain]
Legal Entity [Axis]
Statement [Table]
Statement of Financial Position [Abstract]
Net income per share – diluted (in dollars per share)
Weighted average common shares outstanding – basic (in shares)
Basic (in shares)
Net income per share – basic (in dollars per share)
Statement of Cash Flows [Abstract]
Entity Common Stock, Shares Outstanding (in shares)
Statement of Stockholders' Equity [Abstract]
us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Stock Repurchased and Retired During Period, Value
Income Statement [Abstract]
Investments [Domain]
us-gaap_IncreaseDecreaseInInventories
Inventories
Trading Symbol
Investment Type [Axis]
Investments Classified by Contractual Maturity Date [Table Text Block]
Exercise of stock options (in shares)
us-gaap_TableTextBlock
Notes Tables
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
Exercise of stock options
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]
Selling, general, and administrative
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
Contract Research and Development [Member]
Represents the information pertaining to the contract research and development.
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
FINANCING ACTIVITIES
Raw materials
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and shareholders’ equity
Corporate Bond Securities [Member]
Finished goods
Repurchase Program 2009 [Member]
Information pertaining to the 2009 Repurchase Program.
Work in process
Retained earnings
Research and development
Accumulated other comprehensive income (loss)
Money Market Funds [Member]
Changes in operating assets and liabilities:
us-gaap_StockholdersEquity
Total shareholders’ equity
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
Inventory Disclosure [Text Block]
Subsequent Event [Member]
Schedule of Inventory, Current [Table Text Block]
Class of Stock [Axis]
Total lease liabilities
Operating Lease, Liability, Total
Deferred tax assets
Subsequent Event Type [Axis]
Operating lease
Subsequent Event Type [Domain]
us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Gross Unrealized Holding Losses
Pension and Other Postretirement Benefits Disclosure [Text Block]
Gross Unrealized Holding Gains
Subsequent Events [Text Block]
Schedule of Weighted Average Number of Shares [Table Text Block]
Right-of-use asset – operating lease
Operating Lease, Right-of-Use Asset
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Total lease payments
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
Imputed lease interest
Deferred income taxes
Amortized Cost