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Note 10 - Segments Note 2 - Summary of Significant Accounting Policies and Recently Issued Accounting Pronouncements - Schedule of Plant and Equipment Useful Lives (Details) Note 2 - Summary of Significant Accounting Policies and Recently Issued Accounting Pronouncements - Contract Balances (Details) Furniture, Machinery, and Equipment [Member] Relating to furniture, machinery, and equipment. Note 3 - Accrued and Other Current Liabilities - Schedule of Accrued and Other Current Liabilities (Details) Minimum [Member] Note 5 - Share-Based Compensation - Schedule of Option Activity (Details) Note 5 - Share-Based Compensation - Schedule of Share-based Compensation Expense (Details) Long Term Prepaid Contracts [Policy Text Block] The disclosure of the company's policy regarding long term prepaid contracts. Statistical Measurement [Domain] Note 7 - Leases - Lease Assets and Liabilities (Details) us-gaap_SharePrice Share Price (in dollars per share) Maximum [Member] Note 7 - Leases - Lease Information (Details) Note 7 - Leases - Lease Liability Maturity (Details) Note 8 - Net Loss per Share - Schedule of Antidilutive Securities (Details) Note 10 - Segments - Schedule of Segment Information (Details) Debt Instrument [Axis] us-gaap_IncreaseDecreaseInAccountsReceivable Accounts receivable Note 10 - Segments - Cash and Cash Equivalents and Total Assets (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] OPERATING ACTIVITIES us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash used in operating activities us-gaap_SharesIssuedPricePerShare Shares Issued, Price Per Share (in dollars per share) Advisory costs Carrying value as of the balance sheet date of obligations incurred through that date and payable for advisory costs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Audit services Carrying value as of the balance sheet date of obligations incurred through that date and payable for audit services. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Advertising Cost [Policy Text Block] Accounting Policies [Abstract] Long-Lived Asset, Excluding Intangible Asset and Goodwill, Impairment and Disposal [Policy Text Block] Segments [Domain] Performance Based Stock Options [Member] Relating to performance based stock options. Equity Incentive Plan [Member] Relating to the equity incentive plan. Accounts Receivable [Policy Text Block] us-gaap_LesseeOperatingLeaseDiscountRate Lessee, Operating Lease, Discount Rate Segments [Axis] Regenerative Biotech [Member] Relating to regenerative biotech. Non Performance Based Options [Member] Relating to non-performance based options. us-gaap_IncreaseDecreaseInInventories Inventory Income Statement [Abstract] us-gaap_SecurityDeposit Security Deposit us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) us-gaap_NumberOfOperatingSegments Number of Operating Segments us-gaap_NumberOfReportableSegments Number of Reportable Segments Consumer Health Products [Member] Represents consumer health products. Segment Reporting [Text Block] Income Tax Contingency [Table] Award Type [Axis] Segment Reporting [Table Text Block] Net loss Net loss Net loss Adjustments to reconcile net loss to net cash used in operating activities: Plan Name [Axis] us-gaap_Liabilities Total liabilities Plan Name [Domain] Segment Reporting, Reconciliation of Asset by Segment to Consolidated [Table Text Block] Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] us-gaap_OtherCommitmentDueInNextTwelveMonths Other Commitment, to be Paid, Year One Share-Based Payment Arrangement, Expense Share-Based Payment Arrangement, Expense us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders’ equity us-gaap_AreaOfLand Area of Land (Square Foot) Segment Reporting [Table] us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets Prepaid expenses and other current assets Share-based compensation expense us-gaap_ShareBasedCompensation Subsequent Event [Member] us-gaap_CostsAndExpenses Total operating expenses Accrued and other current liabilities Represents the amount of accrued liabilities and other liabilities classified as current. Accounts payable us-gaap_IncreaseDecreaseInAccountsPayableTrade Lessee, Lease, Description [Table] Income Tax Disclosure [Text Block] Share-Based Payment Arrangement [Text Block] Lease Contractual Term [Axis] Lease Contractual Term [Domain] Changes in operating assets and liabilities: Accounting Standards Update and Change in Accounting Principle [Table] us-gaap_PreferredStockSharesOutstanding Preferred Stock, Shares Outstanding (in shares) Schedule of Accrued Liabilities and Other Current Liabilities [Table Text Block] The tabular disclosure of accrued liabilities and other current liabilities. Assets and Liabilities, Lessee [Table Text Block] Tabular disclosure of lease assets and liabilities of a lessee. us-gaap_PreferredUnitsAuthorized Preferred Units, Authorized (in shares) us-gaap_PreferredStockParOrStatedValuePerShare Preferred Stock, Par or Stated Value Per Share (in dollars per share) us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net decrease in cash and cash equivalents Effect of exchange rate changes on cash New Accounting Pronouncements, Policy [Policy Text Block] Insurance premium financing payable us-gaap_IncreaseDecreaseInNotesPayableCurrent us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash and cash equivalents at the beginning of the year Cash and cash equivalents at the end of the period Concentration Risk, Credit Risk, Policy [Policy Text Block] Antidilutive Securities, Name [Domain] Options vested or expected to vest (in shares) Comprehensive loss: Options vested or expected to vest, aggregate intrinsic value Statement [Table] Options vested or expected to vest, weighted average exercise price (in dollars per share) us-gaap_OperatingLeasePayments Operating Lease, Payments Long-term prepaid contracts Prepaid Expense, Noncurrent Other income (expense), net: Statement of Financial Position [Abstract] us-gaap_NonoperatingIncomeExpense Other income (expense), net The Bridge Note [Member] Related to the bridge note. Useful life (Year) us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total lease payments hrgn_PaymentsOfLongtermPrepaidContracts Payments of Long-term Prepaid Contracts The amount of cash outflow from payments of long-term prepaid contracts. 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17,580,744 shares issued and outstanding at each of March 31, 2026 and December 31, 2025 Earnings Per Share, Policy [Policy Text Block] us-gaap_ProceedsFromIssuanceOfCommonStock Proceeds from Issuance of Common Stock us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) Accounts payable us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_TableTextBlock Notes Tables Computer Equipment [Member] Document Fiscal Period Focus Customer [Domain] Document Fiscal Year Focus us-gaap_ComprehensiveIncomeNetOfTax Comprehensive loss Amendment Flag Common Stock [Member] Subsequent Events [Text Block] Concentration Risk Type [Axis] Document Period End Date Long-Lived Asset, Class [Domain] Legal Entity [Axis] Payroll Significant Accounting Policies [Text Block] Amortization of operating lease right-of-use assets us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Less: imputed interest Entity File Number Operating lease liability, net of current portion Operating lease liability, net of current portion Outstanding, weighted average contractual life (Year) Entity Tax Identification Number us-gaap_OperatingLeaseLiability Present value of operating lease liability Total operating lease liability Current portion of operating lease liability Operating lease liability Entity [Domain] Entity Central Index Key Entity Registrant Name Entity Current Reporting Status Entity Incorporation, State or Country Code Options vested or expected to vest, weighted average contractual life (Year) Current Fiscal Year End Date Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Options exercisable, weighted average contractual life (Year) Concentration Risk Type [Domain] Fair Value Measurement, Policy [Policy Text Block] Research and development Entity Filer Category Entity Shell Company Entity Emerging Growth Company Entity Small Business us-gaap_OperatingIncomeLoss Operating loss Other segment items us-gaap_SegmentReportingOtherItemAmount Other segment items Other Deposits [Member] Relating to other deposits. hrgn_PolicyTable Entity Address, State or Province Statement of Stockholders' Equity [Abstract] Entity Address, City or Town us-gaap_InterestExpenseNonoperating Interest expense Accumulated deficit Retained Earnings (Accumulated Deficit) Entity Address, Address Line One Clinical Activity Trials [Member] Relating to clinical activity trials. Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Statement of Cash Flows [Abstract] City Area Code Foreign currency translation adjustments Local Phone Number Entity Address, Postal Zip Code Other comprehensive loss Stockholders’ equity: Equity Components [Axis] Operating lease liability us-gaap_IncreaseDecreaseInOperatingLeaseLiability Class of Stock [Axis] Equity Component [Domain] Revenue [Policy Text Block] Equity [Text Block] AOCI Attributable to Parent [Member] Entity Common Stock, Shares Outstanding us-gaap_ClassOfWarrantOrRightOutstanding Class of Warrant or Right, Outstanding (in shares) Additional Paid-in Capital [Member] Retained Earnings [Member] Earnings Per Share [Text Block] Insurance Premium Financing Payable [Member] Represents information pertaining to insurance premium financing payable. Foreign Currency Transactions and Translations Policy [Policy Text Block] Property, plant and equipment, net Subsequent Event Type [Domain] Sales and marketing The selling and marketing expense. Subsequent Event [Table] Subsequent Event Type [Axis] Property, Plant, and Equipment [Policy Text Block] Sale of Stock [Axis] Prepaid research and development Prepaid Research and Development, Current Amount of asset related to consideration paid in advance for research and development that provides economic benefits within a future period of one year or the normal operating cycle, if longer. Options exercisable, aggregate intrinsic value Cost of Goods and Service [Policy Text Block] Cost of sales Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share (in dollars per share) Share-based compensation expense Basis of Accounting, Policy [Policy Text Block] Other income Deferred Compensation Arrangement with Individual, Excluding Share-Based Payment and Postretirement Benefit [Table] Long-Lived Asset, Class [Axis] Sale of Stock [Domain] Share-Based Payment Arrangement, Option, Activity [Table Text Block] Total assets us-gaap_Assets Total assets Cash and Cash Equivalents, Policy [Policy Text Block] Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent General and Administrative [Member] General and Administrative Share-Based Payment Arrangement, Option [Member] SUPPLEMENTAL INFORMATION Research and Development [Member] Research and Development Current liabilities: us-gaap_AllowanceForDoubtfulAccountsReceivable Accounts Receivable, Allowance for Credit Loss Services Agreement With Beijing Quarkmed Technology Co. Ltd. [Member] Relating to Services Agreement With Beijing Quarkmed Technology Co. Ltd. us-gaap_LiabilitiesCurrent Total current liabilities Revenue from Contract with Customer [Policy Text Block] Customer [Axis] Deferred revenue Deferred revenue Health Regen [Member] Represents the Health Regen customer. Accounts receivable Customer Concentration Risk [Member] Lease, Cost [Table Text Block] Consolidation, Policy [Policy Text Block] Interest income Interest paid in cash Revenue Benchmark [Member] Other Commitments [Table] Accumulated other comprehensive loss Interim Period, Costs Not Allocable [Domain] Inventory Other Commitments [Axis] Other Commitments [Domain] General and administrative General and administrative Selling, General and Administrative Expenses, Policy [Policy Text Block] Additional paid-in capital Deferred revenue us-gaap_IncreaseDecreaseInContractWithCustomerLiability us-gaap_StockholdersEquity Total stockholders’ equity Balance Balance Segment Reporting, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] Prepaid expenses and other current assets us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) Lessee, Operating Leases [Text Block] Stock, Class of Stock [Table] us-gaap_DebtInstrumentCarryingAmount Long-Term Debt, Gross Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] us-gaap_DebtInstrumentFaceAmount Debt Instrument, Face Amount Consolidation, Less-than-Wholly-Owned Subsidiary, Parent Ownership Interest, Effect of Change [Table] Current assets: Operating lease assets Right-of-use assets, net Operating Lease, Right-of-Use Asset us-gaap_OtherLiabilitiesCurrent Total accrued and other current liabilities us-gaap_AssetsCurrent Total current assets hrgn_IncreaseDecreaseInPrepaidLongTermContracts Long-term prepaid contracts Amount of increase (decrease) in prepaid long term contracts. Unaudited Interim Financial Information (Policy Text Block) Disclosure of unaudited interim financial information. ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] Product revenue ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Accrued and other current liabilities hrgn_IncreaseDecreaseInAccruedAndOtherCurrentLiabilities The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid and other liabilities classified as current. Inventory, Policy [Policy Text Block] us-gaap_StockIssuedDuringPeriodSharesNewIssues Stock Issued During Period, Shares, New Issues (in shares) Commitments and contingencies (Note 6)