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Note 8 - Sublicensing and Collaborative Agreements vtgn_ContractWithCustomerLiabilityDeductions Contract with Customer, Liability, Deductions Amount deducted from purchase of right to consideration in exchange for good or services Note 5 - Capital Stock - Schedule of Common Stock Warrants Outstanding (Details) Non-current liabilities: Note 6 - Stock-Based Compensation (Details) Note 7 - Net Loss Per Common Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) Note 8 - Sublicensing and Collaborative Agreements - Balances of Contract Assets and Liabilities (Details) Warrant modification expense Notes To Financial Statements Notes To Financial Statements [Abstract] Stock-based compensation us-gaap_LiabilitiesCurrent Total current liabilities Operating expenses: us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 Stockholders' Equity Note, Stock Split, Conversion Ratio us-gaap_FinancialLiabilitiesFairValueDisclosure Financial Liabilities Fair Value Disclosure us-gaap_SharesIssuedPricePerShare Shares Issued, Price Per Share us-gaap_AssetsCurrent Total current assets us-gaap_CashAndCashEquivalentsFairValueDisclosure Cash and Cash Equivalents, Fair Value Disclosure Note payable Equity [Text Block] Treasury Stock, Common, Shares (in shares) Common stock, $0.001 par value; 325,000,000 shares authorized at December 31, 2023 and March 31, 2023; 27,029,731 and 7,315,583 shares issued at December 31, 2023 and March 31, 2023, respectively Adjustments to reconcile net loss to net cash used in operating activities: Measurement Frequency [Axis] Measurement Frequency [Domain] Fair Value, Recurring [Member] Common Stock, Shares Authorized (in shares) Common Stock, Shares Authorized Deferred revenue - current portion Contract with Customer, Liability, Current Common Stock, Shares, Issued (in shares) Common Stock, Shares, Issued (in shares) Common Stock, Par or Stated Value (in dollars per share) Common Stock, Par or Stated Value Per Share (in dollars per share) us-gaap_DeferredCostsCurrent Deferred contract acquisition costs - current portion Accrued expenses Supplemental disclosure of noncash activities: Accounts payable vtgn_ProceedsFromSaleOfSecuritiesNetOfExpenses Proceeds from Sale of Equity, Net of Expenses The cash inflow from the sale of securities, net of underwriting discounts, commissions, and offering expenses. 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Preferred Stock, Par or Stated Value (in dollars per share) Preferred Stock, Par or Stated Value Per Share (in dollars per share) The 2019 Omnibus Equity Incentive Plan [Member] Represents information related to the 2019 Omnibus Equity Incentive Plan. Revenue Revenue from Contract with Customer, Including Assessed Tax Advisory Services [Member] Represents advisory services. Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1 [Member] Consulting Firm [Member] Represents a related party consulting firm. vtgn_UpfrontLicensePayment Upfront License Payment Represent upfront license revenue. Fair Value Hierarchy and NAV [Axis] Insurance premiums settled by issuing note payable Represents the insurance premiums settled by issuing note payable. 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Issuance of common stock upon exercise of options (cashless) Value of stock issued as a result of the exercise of cashless stock options. Assets, Current [Abstract] Fair Value Disclosures [Text Block] Public Offering [Member] Represents public offering. Deferred offering costs Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred. 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Counterparty Name [Axis] Counterparty Name [Domain] Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] Jefferies LLC [Member] Represents the other party to the agreement. Commitments and Contingencies Disclosure [Text Block] us-gaap_ContractWithCustomerLiability Deferred revenue Deferred revenue Property and equipment, net Equity Line [Member] Represents equity line. 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Trading Symbol Reverse Stock Split [Member] The conversion of a reverse stock split where there is a reduction in the shares outstanding. dei_LocalPhoneNumber Local Phone Number Issuance of common stock upon exercise of options for cash (in shares) vtgn_PaymentsToAcquireLaboratoryAndOtherEquipment Purchases of laboratory and other equipment Represents cash outflow for laboratory and other equipment. us-gaap_TableTextBlock Notes Tables Sale of common stock pursuant to 2019 Employee Stock Purchase Plan (in shares) Sale of common stock pursuant to 2019 Employee Stock Purchase Plan Warrants Expiring December 9, 2024 [Member] Represents warrants expiring December 9, 2024. Issuance of common stock upon exercise of options for cash Related Party, Type [Axis] Related Party, Type [Domain] vtgn_RevenueFromContractWithCustomerIncludingAssessedTaxDerecognized Sublicense and other revenue Revenue from Contract with Customer Including Assessed Tax, Derecognized Represents derecognized revenue from contract with customer including assessed tax. 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Money Market Funds [Member] Former Chief Financial Officer [Member] Represents former chief financial officer. Cash and Cash Equivalents [Axis] Debt Disclosure [Text Block] Pre-funded Warrants, T1 Warrants and T2 Warrants [Member] Represents pre-funded warrants, T1 warrants and T2 warrants. Cash and Cash Equivalents [Domain] vtgn_ConsultingFeesInitialPayment Consulting Fees, Initial Payment Amount of initial payment for consulting fees. Consulting Agreement [Member] Represents consulting agreement. Pre-funded Warrants in Lieu Thereof T2 Warrants [Member] Represents Pre-funded Warrants in Lieu Thereof T2 Warrants. Changes in operating assets and liabilities: T2 Warrants [Member] Represents T2 warrants. Deferred revenue - non-current portion Contract with Customer, Liability, Noncurrent Balances Total stockholders’ equity Balances Balances Amortization of operating lease right-of-use asset Public Offering Common Stock and Warrants [Member] Represents public offering common stock and warrants. vtgn_StockAndWarrantsIssuedCombinedOfferingPrice Stock and Warrants Issued, Combined Offering Price Represents combined offering price for stock and warrants issued. Sublicense [Member] Represents sublicense. us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Fuji Pharma [Member] Represents Fuji Pharma. Operating lease obligation - non-current portion vtgn_ConsultingFeesMonthlyPayment Consulting Fees, Monthly Payment Monthly payment for consulting fees. 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Deferred contract acquisition costs - non-current portion Financing lease obligation - non-current portion Deferred Revenue [Member] Represents deferred revenue. Security deposits Deferred Contract Acquisition Costs [Member] Represents Deferred Contract Acquisition Costs. Right-of-use asset - operating lease Warrants With Exercise Price of 5.380 [Member] Warrants With Exercise Price of 5.380 Warrants With Exercise Price of 0.001 [Member] Warrants With Exercise Price of 0.001. Principal payments on financing lease obligations Warrants With Exercise Price of 8.877 [Member] Warrants With Exercise Price of 8.877