Equity Components [Axis] Common Stock [Member] Class of Stock [Axis] Common Class B [Member] Common Class C [Member] Preferred Class A [Member] Class A Non Voting Preferred Stock [Member] Preferred Stock [Member] Common Stockholders [Member] Class A Non Voting Preferred Stockholders [Member] Additional Paid-in Capital [Member] Class A Preferred Stock [Member] Class C Common Stock [Member] Retained Earnings [Member] Treasury Stock, Common [Member] Noncontrolling Interest [Member] Investment, Name [Axis] Nonconsolidated Investees, Other [Member] Health Care Organization, Revenue Sources [Axis] Commercial Insurance Managed Care [Member] Medicare Medicaid [Member] Workers Compensation Personal Injury [Member] Other Revenue Source [Member] Class C Common [Member] Receivable Type [Axis] Accounts Receivable [Member] Doubtful [Member] Related and Nonrelated Parties [Axis] Additions [Member] Deductions [Member] Related Party Transaction [Axis] Operating Lease Payments [Member] Financing Lease Payments [Member] Long-Lived Tangible Asset [Axis] Diagnostic Equipment [Member] Research Development And Demonstration Equipment [Member] Machinery and Equipment [Member] Furniture and Fixtures [Member] Leasehold Improvements [Member] Building [Member] Finite-Lived Intangible Assets by Major Class [Axis] Software and Software Development Costs [Member] License [Member] Patents And Copyrights [Member] Noncompete Agreements [Member] Statistical Measurement [Axis] Minimum [Member] Maximum [Member] Customer Relationships [Member] Software License [Member] Employment Contract [Member] Indefinite-Lived Intangible Assets [Axis] Total [Member] Non Compete [Member] Product and Service [Axis] Manufacturing And Service Of Medical Equipment [Member] Health Care, Other [Member] Title and Position [Axis] Board of Directors Chairman [Member] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Magnetic Resonance Management [Member] Statement [Table] Statement [Line Items] Document Type Amendment Flag Amendment Description Document Registration Statement Document Annual Report Document Quarterly Report Document Transition Report Document Shell Company Report Document Shell Company Event Date Document Period Start Date Document Period End Date Document Fiscal Period Focus Document Fiscal Year Focus Current Fiscal Year End Date Entity File Number Entity Registrant Name Entity Central Index Key Entity Primary SIC Number Entity Tax Identification Number Entity Incorporation, State or Country Code Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Three Entity Address, City or Town Entity Address, State or Province Entity Address, Country Entity Address, Postal Zip Code Country Region City Area Code Local Phone Number Extension Written Communications Soliciting Material Pre-commencement Tender Offer Pre-commencement Issuer Tender Offer Title of 12(b) Security No Trading Symbol Flag Trading Symbol Security Exchange Name Title of 12(g) Security Security Reporting Obligation Annual Information Form Audited Annual Financial Statements Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Elected Not To Use the Extended Transition Period Document Accounting Standard Other Reporting Standard Item Number Entity Shell Company Entity Public Float Entity Bankruptcy Proceedings, Reporting Current Entity Common Stock, Shares Outstanding Documents Incorporated by Reference [Text Block] Current Assets:  Cash and cash equivalents  Short-term investments  Accounts receivable – net of allowances for credit losses of $124 and $264 at March 31, 2026 and June 30, 2025, respectively  Accounts receivable – related party  Medical receivable  Management and other fees receivable – net of allowances for credit losses of $11,930 and $14,296 at March 31, 2026 and June 30, 2025, respectively  Management and other fees receivable – related medical practices – net of allowances for credit losses of $9,320 and $7,137 at March 31, 2026 and June 30, 2025, respectively  Inventories – net  Prepaid expenses and other current assets – related party  Prepaid expenses and other current assets Total Current Assets  Accounts receivable – long-term  Deferred income tax asset  Property and equipment – net  Note receivable – related party  Right-of-use asset – operating leases  Right-of-use asset – finance lease  Goodwill  Other intangible assets – net  Other assets   Total Assets Current Liabilities: Accounts payable Other current liabilities  Unearned revenue on service contracts  Unearned revenue on service contracts – related party  Operating lease liabilities – current portion  Finance lease liability – current portion Customer deposits Total Current Liabilities Long-Term Liabilities:  Unearned revenue on service contracts  Deferred income tax liability  Due to related party medical practices  Operating lease liabilities – net of current portion  Finance lease liability – net of current portion  Other liabilities Total Long-Term Liabilities   Total Liabilities EQUITY: Preferred stock value Common stock value  Paid-in capital in excess of par value  Retained Earnings (Accumulated deficit) Treasury stock, at cost – 4 shares of common stock at March 31, 2026 and 35 at June 30, 2025  Total FONAR Corporation’s Stockholders’ Equity  Noncontrolling interests  Total Equity  Total Liabilities and Equity Accounts receivable net of allowance for credit losses Management and other fees receivable net of allowance for credit losses Management and other fees receivable related medical practices net of allowance for credit losses Preferred stock, par value Preferred stock, shares authorized Preferred stock, shares issued Preferred stock, shares outstanding Common stock, par value Common stock, shares authorized Common stock, shares issued Common stock, shares outstanding Treasury stock shares Revenues Patient fee revenue – net of contractual allowances and discounts Product sales Service and repair fees Service and repair fees – related parties Management and other fees Management and other fees – related medical practices Total Revenues – Net Cost and Expenses Costs related to patient fee revenue Costs related to product sales Costs related to service and repair fees Costs related to service and repair fees – related parties Costs related to management and other fees Costs related to management and other fees – related medical practices Research and development Selling, general and administrative expenses Total Costs and Expenses Income from Operations Other income and (expenses): Interest expense Interest income – related party Investment income Other income (expense) Income Before Provision for Income Taxes and Noncontrolling Interests Provision for income taxes Consolidated Net Income Net Income – Noncontrolling Interests Net Income – Attributable to FONAR Net Income Available to Common Stockholders Earnings Per Share, Basic Earnings Per Share, Diluted Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Diluted Beginning balance, value Beginning balance, Shares Net Income Purchase of Treasury stock Cancellation of Treasury Stock, Shares Distributions Non controlling interest Income Non controlling interests Cancellation of Treasury stock Purchase of Treasury Stock, Shares Sale Non controlling interests Ending balance, value Ending balance, Shares Statement of Cash Flows [Abstract] Cash Flows from Operating Activities:  Consolidated net income  Adjustments to reconcile consolidated net income to net cash provided by operating activities: Depreciation and amortization Net change in operating right-of-use assets and lease liabilities (Recovery) provision for credit losses Abandoned patents Deferred tax expense Changes in operating assets and liabilities, net: Accounts, medical and management fee receivable(s) Notes receivable – related party Inventories Prepaid expenses and other current assets Other assets Accounts payable Other current liabilities Finance lease liabilities Customer deposits Other liabilities Net cash provided by operating activities Cash Flows from Investing Activities: Purchases of property and equipment Cost of non-compete contract (Purchase) Proceeds from short-term investments Cost of patents Net cash used in investing activities Cash Flows from Financing Activities: Repayment of borrowings and capital lease obligations Sale of noncontrolling interest Purchase of treasury stock Distributions to noncontrolling interests Net cash used in financing activities  Net Decrease in Cash and Cash Equivalents Cash and Cash Equivalents - Beginning of Period Cash and Cash Equivalents - End of Period Pay vs Performance Disclosure [Table] Executive Category [Axis] Individual [Axis] Adjustment to Compensation [Axis] Measure [Axis] Pay vs Performance Disclosure, Table Company Selected Measure Name Named Executive Officers, Footnote Peer Group Issuers, Footnote Changed Peer Group, Footnote PEO Total Compensation Amount PEO Actually Paid Compensation Amount Adjustment To PEO Compensation, Footnote Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Compensation Actually Paid Amount Adjustment to Non-PEO NEO Compensation Footnote Equity Valuation Assumption Difference, Footnote Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Company Selected Measure Total Shareholder Return Vs Peer Group Compensation Actually Paid vs. Other Measure Tabular List, Table Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net Income (Loss) Company Selected Measure Amount Other Performance Measure, Amount Adjustment to Compensation, Amount PEO Name Name Non-GAAP Measure Description Additional 402(v) Disclosure Pension Benefits Adjustments, Footnote Equity Awards Adjustments, Footnote Erroneously Awarded Compensation Recovery [Table] Restatement Determination Date [Axis] Restatement Determination Date Aggregate Erroneous Compensation Amount Erroneous Compensation Analysis Stock Price or TSR Estimation Method Outstanding Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Not Yet Determined Name Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery, Explanation of Impracticability Name Compensation Amount Restatement does not require Recovery Awards Close in Time to MNPI Disclosures [Table] Award Type [Axis] Award Timing MNPI Disclosure Award Timing Method Award Timing Predetermined Award Timing MNPI Considered Award Timing, How MNPI Considered MNPI Disclosure Timed for Compensation Value Awards Close in Time to MNPI Disclosures, Table Name Underlying Securities Exercise Price Fair Value as of Grant Date Underlying Security Market Price Change Trading Arrangements, by Individual [Table] Trading Arrangement [Axis] Material Terms of Trading Arrangement Name Title Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted Adoption Date Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated Termination Date Expiration Date Arrangement Duration Aggregate Available Insider Trading Policies and Procedures [Line Items] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Not Adopted Description Of Business And Basis Of Presentation DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Accounting Policies [Abstract] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Receivables [Abstract] ACCOUNTS RECEIVABLE, MEDICAL RECEIVABLE AND MANAGEMENT AND OTHER FEES RECEIVABLE Operating And Financing Leases OPERATING AND FINANCING LEASES Property, Plant and Equipment [Abstract] PROPERTY AND EQUIPMENT Inventory Disclosure [Abstract] INVENTORIES Goodwill and Intangible Assets Disclosure [Abstract] OTHER INTANGIBLE ASSETS Payables and Accruals [Abstract] OTHER CURRENT LIABILITIES Segment Reporting [Abstract] SEGMENT AND RELATED INFORMATION Supplemental Cash Flow Elements [Abstract] SUPPLEMENTAL CASH FLOW INFORMATION Commitments and Contingencies Disclosure [Abstract] COMMITMENTS AND CONTINGENCIES Income Tax Disclosure [Abstract] INCOME TAXES Related Party Transactions [Abstract] RELATED PARTY TRANSACTIONS Subsequent Events [Abstract] SUBSEQUENT EVENTS Use of Estimates Principles of Consolidation Revenue Recognition Patient fee revenue Management and other fees revenue Earnings Per Share Recent Accounting Standards or Updates Not Yet Adopted Medical Receivable Schedule of patient fee revenue - net Schedule of earning per share Schedule of financing receivable noncurrent allowance for credit loss schedule of Allowance For Credit Losses Schedule of future revenue Schedule of lessee operating leases liability maturity Schedule of weighted average remaining lease term Components of lease expense Supplemental cash flow information related to leases Schedule of Property and equipment Schedule of inventories Schedule of other intangible assets Schedule of Amortization expense Schedule of other current liabilities Schedule of summarized segment financial information Investment Owned, Net Assets, Percentage Equity Method Investment, Ownership Percentage Proceeds from (Payments to) Noncontrolling Interests Disaggregation of Revenue [Table] Disaggregation of Revenue [Line Items] Patient Fee Revenue, net of contractual allowances and discounts Net income available to common stockholders Weighted average shares outstanding Basic income per common share Weighted average shares outstanding Convertible Class C Stock Total Denominator for diluted earnings per share Diluted income per common share Accounts and Financing Receivables [Table] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts receivable Accounts receivable - related party Medical receivable Management and other fees receivable Management and other fees receivable from related medical practices (“PC’s”) Defined Benefit Plan [Table] Defined Benefit Plan Disclosure [Line Items] Accounts receivable Management and other fees receivable Management and other fees receivable - related medical practices 2026 2027 2028 2029 Total Long term-accounts receivable Revenues Net revenues Related Party Transaction [Table] Related Party Transaction [Line Items] 2026 2026 2027 2027 2028 2028 2029 2029 2030 2030 Thereafter Thereafter Present value discount Present value discount Total lease liability Total lease liability Operating Financing Leases Operating leases - years Finance lease - years Operating leases Finance lease Operating lease cost Finance lease cost: Depreciation of leased equipment Interest on lease liabilities Total finance lease cost Operating cash flows from operating leases Financing cash flows from financing leases Right-of-use and equipment assets obtained in exchange for lease obligations:  Operating leases Property, Plant and Equipment [Table] Property, Plant and Equipment [Line Items] Property and equipment Less: Accumulated depreciation and amortization Property and equipment net Depreciation of property and equipment Purchased parts, components and supplies Work-in-process Total inventories Intangible Asset, Finite-Lived [Table] Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Gross carrying amount intangible assets Accumulated amortization intangible assets Net carrying amount intangible assets Intangible Asset, Indefinite-Lived [Table] Indefinite-Lived Intangible Assets [Line Items] 2027 2028 2029 2030 2031 Thereafter Other intangible assets - net Amortization of Intangible Assets Accrued salaries, commissions and payroll taxes Sales tax payable Self-funded health insurance reserve Property taxes Utilities Legal and other professional fees Accounting fees Software licenses Recruiting fees Other general and administrative expenses Other current liabilities Segment Reporting, Revenue from External Customer, Product and Service [Table] Revenue from External Customer [Line Items] Net revenues from external customers Cost of Sales Salaries and wages Rent expense Other Cost of sales expenses** Total Cost of sales Salaries and wages Other research and development costs** Total Research and development costs Salaries and wages Rent expense Other selling, general and administrative expenses** Total Selling, general and administrative expenses Total costs and expenses (Loss) Income from operations Investment income Other income (expense) (Loss) Income before provision for income taxes Provision for income taxes Net (Loss) income Intersegment net revenues * Depreciation and amortization Total identifiable assets Interest Paid, Excluding Capitalized Interest, Operating Activity Income Taxes Paid Rate of interest sold Conversion of Stock, Amount Converted Share Repurchase Program, Authorized, Amount Stock Repurchased During Period, Shares Stock Repurchased During Period, Value Stock Redeemed or Called During Period, Shares Stock Redeemed or Called During Period, Value Share Repurchase Program, Remaining Authorized, Amount Liability for Claims and Claims Adjustment Expense Self Insurance Reserve Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability Extinguishment of Debt, Gain (Loss), Net of Tax Deferred income tax component Deferred Tax Assets, Net of Valuation Allowance Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Policyholders' Surplus Collaborative Arrangement and Arrangement Other than Collaborative [Table] Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Net revenues Service and maintenance price Service and repair fees Employees fee Convertible notes payable Derivative fixed interest rate Assets, Current Assets Liabilities, Current Deferred Revenue, Noncurrent Liabilities, Noncurrent Liabilities Treasury Stock, Value Equity, Attributable to Parent Equity, Including Portion Attributable to Noncontrolling Interest Liabilities and Equity Income (Loss) from Continuing Operations before Interest Expense, Interest Income, Income Taxes, Noncontrolling Interests, Net Interest Expense, Nonoperating Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income Tax Expense (Benefit) ConsolidatedNetIncome Shares, Outstanding Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders CancellationOfTreasuryStock NetChangeInOperatingRightOfUseAssetsAndLeaseLiabilities Increase (Decrease) in Accounts Receivable Increase (Decrease) in Inventories Increase (Decrease) in Prepaid Expenses, Other Increase (Decrease) in Other Noncurrent Assets Increase (Decrease) in Accounts Payable Increase (Decrease) in Other Current Liabilities IncreaseDecreaseInCustomerDeposit Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Payments to Acquire Property, Plant, and Equipment CostOfNoncompeteContract ProceedspurchaseFromShortTermInvestments Payments to Acquire Intangible Assets Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Repayments of Notes Payable Payments for Repurchase of Convertible Preferred Stock Payments of Ordinary Dividends, Noncontrolling Interest Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Forgone Recovery, Individual Name Outstanding Recovery, Individual Name Awards Close in Time to MNPI Disclosures, Individual Name Trading Arrangement, Individual Name AccountsAndNotesReceivables ManagementAndOtherFeesReceivable PercentageOfPcsNetRevenueDerivedFromNofaultAndPersonalInjuryProtectionClaims Lessee, Operating Lease, Liability, to be Paid, Year One Finance Lease, Liability, to be Paid, Year One Lessee, Operating Lease, Liability, to be Paid, Year Two Finance Lease, Liability, to be Paid, Year Two Lessee, Operating Lease, Liability, to be Paid, Year Three Finance Lease, Liability, to be Paid, Year Three Lessee, Operating Lease, Liability, to be Paid, Year Four Finance Lease, Liability, to be Paid, Year Four Finance Lease, Liability, to be Paid, Year Five Finance Lease, Liability, to be Paid, after Year Five PresentValueDiscountFinancingLease Finance Lease, Liability Inventory, Net Finite-Lived Intangible Asset, Expected Amortization, Year One Finite-Lived Intangible Asset, Expected Amortization, Year Two Finite-Lived Intangible Asset, Expected Amortization, Year Three Finite-Lived Intangible Asset, Expected Amortization, Year Four Finite-Lived Intangible Asset, Expected Amortization, after Year Five Salary and Wage, NonOfficer, Excluding Cost of Good and Service Sold SalariesAndWagesExpenses RentExpense InvestmentIncome Other Income Depreciation, Depletion and Amortization NetRevenuess ServiceAndRepairFees