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Public Banking Revenue [Member] Range 5 [Member] Range Five [Member] Range Five [Member] Common stock for issuance pursuant to stock options or restricted stock Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Segment Reporting Segment Reporting Disclosure [Text Block] Total net revenue Revenue Revenue from Contract with Customer, Including Assessed Tax Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares Vested Expired/forfeited Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total Expired/forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period Number of share issued to option holder Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Net Intangible Assets Finite-Lived Intangible Assets, Net, Ending Balance Finite-Lived Intangible Assets, Net, Beginning Balance Finite-Lived Intangible Assets, Net Contracted storage amortization period Other Current Contract Assets Amortization Periods Other current contract assets amortization periods. Impairment of contract assets Impairment Of Contract Assets Impairment of contract assets. Share-Based Compensation Arrangement by Share-Based Payment Award, Option, Nonvested, Weighted Average Exercise Price Non-vested at May 31, 2026, Weighted Average Grant-Date Fair Value Non-vested at November 30, 2025, Weighted Average Grant-Date Fair Value Brand [Member] Brand [Member] Brand [Member] Accounts Receivable Net Current Deductions Accounts receivable net current deductions. Accounts receivable, Deductions Recently Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Summary of Maturity of Company's Lease Liabilities Short-term contract liabilities (deferred revenue) Deferred revenue Contract with Customer, Liability, Current Number of units, per month Number Of Inventory Units Per Month Number of inventory units per month. Range 4 [Member] Range Four [Member] Range four. Unrecognized compensation cost related to non-vested share-based compensation arrangements granted Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common stock, shares outstanding Common Stock, Shares, Outstanding Current portion of operating lease liabilities Current portion of operating lease liability Operating Lease, Liability, Current Depreciation, Depletion and Amortization, Total Depreciation and amortization expense Depreciation, Depletion and Amortization Deferred revenue Revenue, Remaining Performance Obligation, Amount Dividends [Domain] Document Transition Report Document Transition Report Range 3 [Member] Range Three [Member] Range three. Research and Development Expense, Total Research, development and related engineering Research and Development Expense Leases Lessee, Operating Leases [Text Block] Treasury stock purchases Payments for Repurchase of Common Stock Statement of Cash Flows [Abstract] Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Disclosure Of Lease Assets And Liabilities [Abstract] Disclosure Of Lease Assets And Liabilities [abstarct] Patent option and technology license agreement. Patent Option And Technology License Agreement [Line Items] Patent Option And Technology License Agreement [Line Items] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Income per Common Share Earnings Per Share [Text Block] Beginning balance, shares Ending balance, shares Shares, Issued Number of shares issued Share Repurchase Plan Treasury Stock [Text Block] Contract assets (sales commissions), Additions Contract With Customer Asset Net Current Additions Contract with customer asset net current additions. Net Income Net income Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Outstanding at November 30, 2025, Aggregate Intrinsic Value Outstanding at May 31, 2026, Aggregate Intrinsic Value Increase (Decrease) in Inventories, Total Inventory Increase (Decrease) in Inventories Inventory [Line Items] Inventory [Line Items] Range 1 [Member] Range One [Member] Range one. Expected dividends Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Uncertain tax provisions Liability for Uncertainty in Income Taxes, Current Intangible Assets, Net (Excluding Goodwill), Total Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Line of Credit Facility [Line Items] Operating cash outflows from operating leases Operating Lease, Payments Assets ASSETS Assets [Abstract] Risk free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Document Fiscal Year Focus Document Fiscal Year Focus Exercise Price Range Exercise Price Range [Domain] Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Deferred revenue recognition period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Range of Exercise Prices Maximum Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit Accounts Payable, Current, Total Accounts payable Accounts Payable, Current Share based compensation options fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value Interest Expense, Nonoperating Interest Expense, Nonoperating, Total Interest expense Total interest expense Interest Expense, Long-Term Debt Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Schedule of Assets and Liabilities from Contracts With Customers Expired/forfeited, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Expired or Forfeited, Intrinsic Value Share-based compensation arrangement by share-based payment award, options, expired or forfeited, intrinsic value. Proceeds from the exercise of stock options Proceeds from Stock Options Exercised Commitments and Contingencies Disclosure [Abstract] Lessee, Operating Lease, Liability, to be Paid, Year One 2027 Range 6 [Member] Range Six [Member] Range six. Option One [Member] Option One [Member] Option One [Member] Line of credit facility, amount advanced Long-term line of credit Long-term Line of Credit, Total Long-Term Line of Credit Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total Contract assets (sales commissions) Contract assets (sales commissions), Beginning balance Contract assets (sales commissions), Ending balance Contract with Customer, Asset, after Allowance for Credit Loss, Current Share-Based Payment Arrangement [Abstract] Total Assets, Fair Value Disclosure Total Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Net cash from (used) in investing activities Title of 12(b) Security Title of 12(b) Security Schedule Of Segment Reporting Information By Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Range 7 [Member] Range Seven [Member] Range seven. O 2025 Q2 Dividends [Member] O 2025 Q2 dividends. O 2025 Q2 Dividends [Member] Patents [Member] Patents [Member] Total other liabilities Other Liabilities, Noncurrent Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Outstanding at November 30, 2025, Weighted Average Exercise Price Outstanding at May 31, 2026, Weighted Average Exercise Price Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Additional Paid-In Capital [Member] Additional Paid-in Capital [Member] Measurement Frequency Measurement Frequency [Domain] Income Statement Location Statement of Income Location, Balance [Axis] Trading Symbol Trading Symbol Schedule Of Finite Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Purchases of marketable securities Payments to Acquire Marketable Securities and Other Investments Payments to acquire marketable securities and other investments. Purchases of marketable securities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Cash flows used in financing activities: Expected life Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Fair Value, Measurements, Recurring [Member] Fair Value, Recurring [Member] Less: Imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Equity Components Equity Components [Axis] Collection kits Inventory Collection Kits Inventory, collection kits. Public Cord Blood Banking [Member] Public Cord Blood Banking [Member] Public cord blood banking. Line of credit Line of Credit, Current Nonoperating Income (Expense) Total other (expense) income Equity Component Equity Component [Domain] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Lessee Operating Lease Liability Maturity [Abstract] Lessee Operating Lease Liability Maturity [Abstract] Other current assets Increase (Decrease) in Other Current Assets Service Based Stock Options [Member] Service Based Stock Options [Member] Service Based Stock Options [Member] Notes Payable, Noncurrent, Total Long-term note payable, net of debt issuance costs Note payable, net of current portion and debt issuance costs Notes Payable, Noncurrent Depreciation, Depletion and Amortization, Nonproduction, Total Total depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Consideration payable for research The amount of consideration payable for research Consideration payable for research Deposits and other assets, net Deposits And Other Assets Deposits and other assets. Maximum [Member] Maximum [Member] Dividends Payable, Date to be Paid Dividend payable date Statistical Measurement [Axis] Statistical Measurement Exercised, Weighted Average Exercise Price Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted average exercise price per share Long-term contract liabilities (deferred revenue) Deferred revenue, net of current portion Contract with Customer, Liability, Noncurrent Less: Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Prepaid Expense, Current, Total Prepaid expenses Prepaid Expense, Current Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Common Stock, Value, Issued Common stock ($.01 par value, 20,000,000 authorized; 14,884,619 issued and 8,062,650 outstanding as of May 31, 2026 and 14,877,119 issued and 8,055,150 outstanding as of November 30, 2025) Dividends [Axis] Disclosure Of Remaining Lease Term And Discount Rates [Abstract] Disclosure Of Remaining Lease Term And Discount Rates [abstract] Capitalized Contract Cost Capitalized Contract Cost [Axis] Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Amortization of debt issuance costs Amortization of Debt Issuance Costs 2022 Equity Incentive Plan [Member] Two Thousand Twenty Two Equity Incentive Plan [Member] Two thousand twenty two equity incentive plan. Patent Option Agreement [Abstract] Patent option agreement. Total inventory Inventory Current And Noncurrent The amount represents inventory current and non current. Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Preferred stock, shares authorized Preferred Stock, Shares Authorized Costs and Expenses Total costs and expenses Finite-Lived Intangible Assets by Major Class Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Note Payable Obligation Schedule of Debt [Table Text Block] Lender Name Lender Name [Axis] Option Three [Member] Option Three [Member] Option Three [Member] Range of Exercise Prices Minimum Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit Entity Registrant Name Entity Registrant Name Notes Payable Debt Disclosure [Text Block] SOFR Term Loans [Member] SOFR term loans. SOFR Term Loans [Member] Number of shares repurchased Treasury Stock, Shares, Acquired Other Nonoperating Income (Expense), Total Other income Other Nonoperating Income (Expense) Exercisable, Weighted Average Exercise Price Share-Based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) [Member] Income Tax Expense (Benefit), Total Income tax expense Income Tax Expense (Benefit) Measurement Frequency Measurement Frequency [Axis] Costs and Expenses [Abstract] Costs and Expenses: Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Interest Expense, Debt [Abstract] Consolidation Items Consolidation Items [Axis] Payments to Acquire Property, Plant, and Equipment, Total Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Total assets Total assets Assets Inventories Inventory, Policy [Policy Text Block] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Exercisable at May 31, 2026, Weighted Average Remaining Contractual Term (Years) Income Statement [Abstract] Required ratio of indebtedness to net capital Ratio of Indebtedness to Net Capital Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Stock Compensation Share-Based Payment Arrangement [Policy Text Block] Selling, General and Administrative Expenses [Member] Selling, General and Administrative Expenses [Member] Earnings Per Share, Diluted, Total Diluted Net income per common share - diluted Earnings Per Share, Diluted Summary of Net Revenue, Cost of Sales, Depreciation and Amortization, Operating Profit, and Interest Expense and Assets by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Operating Segments [Member] Operating Segments [Member] Title of Individual Title and Position [Domain] Dividends, Common Stock, Total Dividends, Common Stock Dividends declared City Area Code City Area Code Employment agreements period. Employment Agreements Period Employee agreements period License Agreement [Member] Licensing Agreements [Member] Proceeds from Lines of Credit, Total Proceeds from Lines of Credit Proceeds from line of credit Second amended and restated promissory note principal amount Debt Instrument, Face Amount Term loan, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Contract liabilities (deferred revenue), Deductions Contract With Customer Liability Deductions Contract with customer liability deductions. David Portnoy [Member] Co Ceo One [Member] Co CEO One [Member] Operating lease, Remaining lease term (years) Operating Lease, Weighted Average Remaining Lease Term Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Basic And Diluted Earnings Loss Per Common Share [Abstract] Basic And Diluted Earnings Loss Per Common Share [Abstract] Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Total Property and Equipment-net Property, Plant and Equipment, Net Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Cash and cash equivalents - beginning of period Cash and cash equivalents - end of period Total operating profit Operating Income Operating Income (Loss) Accumulated Deficit [Member] Retained Earnings [Member] Share-based Payment Arrangement, Noncash Expense, Total Compensatory element of stock options Share-Based Payment Arrangement, Noncash Expense Number of shares authorized to repurchase Share Repurchase Program, Authorized, Number of Shares Operating lease, Discount rate (percentage) Operating Lease, Weighted Average Discount Rate, Percent Operating lease long-term liability Operating Lease, Liability, Noncurrent Operating lease long-term liabilities Fair Value, Inputs, Level 1 Fair Value, Inputs, Level 1 [Member] Level 1 Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Net cash used in financing activities Notes Payable, Total Note payable Notes Payable Note payable Unamortized Debt Issuance Expense Unamortized debt issuance costs Other Income (Expense): Nonoperating Income (Expense) [Abstract] Additional capitalized contract acquisition costs, net of amortization expense Increase Decrease In Capitalized Contract Cost Increase Decrease In Capitalized Contract Cost Entity Interactive Data Current Entity Interactive Data Current Deferred revenue Increase (Decrease) in Contract with Customer, Liability Income Statement Location Statement of Income Location, Balance [Domain] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Repayment of line of credit Repayments of Lines of Credit Disclosure Of Supplemental Cash Flow Information Related To Leases [Abstract] Disclosure Of Supplemental Cash Flow Information Related To Leases [abstract] Common Stock, Dividends, Per Share, Declared Dividends declared Dividends declared Option Indexed to Issuer's Equity, Type Option Indexed to Issuer's Equity, Type [Domain] Entity Tax Identification Number Entity Tax Identification Number Share Price Price per share Repayments of note payable Repayments of Notes Payable Long-term Debt, Type Long-Term Debt, Type [Axis] Marketable Securities, Unrealized Gain (Loss), Total Marketable Security, Unrealized Gain (Loss) Unrealized holding (losses) gains, marketable securities Unrealized holding (losses) gains, marketable securities Gains (losses) on marketable securities Losses on marketable securities Local Phone Number Local Phone Number Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding, Ending Balance Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding, Beginning Balance Outstanding, Outstanding Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Number Share based compensation arrangement by share based payment award options exercisable weighted average number. Exercisable at May 31, 2026, Weighted Average Exercise Price Accounting Policies [Abstract] Term Loan [Member] Term Loan [Member] Term Loan [Member] Summary of Lease Assets and Liabilities Disclosure Of Lease Assets And Liabilities Table [Text Block] Disclosure Of Lease Assets And Liabilities [table text block] Numerator: Net Income (Loss) Attributable to Parent [Abstract] Class of Stock Class of Stock [Domain] Shares issued under stock incentive plan Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Weighted-average period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Capitalized Contract Cost Capitalized Contract Cost [Domain] Amount on Excess Damages Amount on excess damages. Amount on excess damages Less: Intangible asset impairment Intangible Asset Impaired Accumulated Impairment Loss Intangible asset impaired accumulated impairment loss. Entity Emerging Growth Company Entity Emerging Growth Company