Document And Entity Information [Abstract] Document Information [Table] Class of Stock [Axis] Statement of Financial Position [Abstract] Assets [Abstract] Assets ASSETS Assets, Current [Abstract] Current assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Cash and cash equivalents at the beginning of year Cash and cash equivalents at the end of year Restricted Cash and Cash Equivalents, Current Restricted cash Accounts Receivable, Net, Current Accounts receivable, net of allowance for doubtful accounts of $1,817,050 and $1,648,178, respectively Accounts receivable, net Notes, Loans and Financing Receivable, Net, Current Notes receivable Other Receivables, Net, Current Other receivables Inventory, Net Inventories Total Prepaid Supplies Advance to suppliers Beginning balance Ending balance Deferred Tax Assets, Net of Valuation Allowance, Current Deferred tax assets, current portion Total Assets, Current Total current assets Property, Plant and Equipment, Net Property, plant and equipment, net Property, plant and equipment, net Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Other Assets, Noncurrent Other long-term assets Liabilities and Equity [Abstract] LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Accounts Payable and Accrued Liabilities, Current Accrued expenses and other current liabilities Accrued Employee Benefits, Current Accrued payroll and welfare Customer Advances, Current Advance from customers Beginning balance Ending balance Due to Related Parties, Current Related party payables Loans Payable to Bank, Current Short-term bank borrowings Amount Notes Payable, Current Notes payable Taxes Payable, Current Income tax payable Stockholders' Equity Attributable to Parent [Abstract] Equity Common Stock, Value, Issued Common stock, no par value, 50,000,000 shares authorized, 13,068,346 and 9,000,000 shares issued and outstanding, respectively Common stock, $0.001 par value, 50,000,000 shares authorized, 13,068,346 and 9,000,000 shares issued and outstanding, respectively Additional Paid in Capital, Common Stock Additional paid-in capital Statutory Accounting Practices, Statutory Capital and Surplus Required Statutory surplus reserve Retained Earnings (Accumulated Deficit) Retained earnings Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Stockholders' Equity Attributable to Parent Total equity attributable to ZK International Group Co., Ltd. Total stockholders' equity Total stockholders' equity Stockholders' Equity Attributable to Noncontrolling Interest Equity attributable to non-controlling interests Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total equity Balance Balance Assets TOTAL ASSETS Total assets Liabilities and Equity TOTAL LIABILITIES AND EQUITY Total liabilities and stockholders’ equity Statement [Table] Class of Stock [Domain] Statement [Line Items] Allowance for Doubtful Accounts Receivable, Current Less: allowance for doubtful accounts Beginning balance Ending balance Common Stock, Shares Authorized Common Stock, No Par Value Common Stock, Shares, Issued Common Stock, Shares, Outstanding Income Statement [Abstract] Revenues Revenues Cost of Revenue Cost of sales Gross Profit Gross profit Operating Expenses [Abstract] Operating expenses: Selling and Marketing Expense Selling and marketing expenses General and Administrative Expense General and administrative expenses Research and Development Expense Research and development costs Operating Expenses Total operating expenses Total operating expenses Operating Income (Loss) Operating Income Nonoperating Income (Expense) [Abstract] Other income (expenses): Interest Expense Interest expenses Investment Income, Interest Interest income Other Nonoperating Income (Expense) Other income, net Nonoperating Income (Expense) Total other expenses, net Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income before income taxes Income Tax Expense (Benefit) Income tax provision Total Income tax expenses Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income Net income Net income Net loss Net loss Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to non-controlling interests Net Income (Loss) Attributable to Parent Net income attributable to ZK International Group Co., Ltd. Net loss and comprehensive loss Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation adjustment Foreign currency translation gain (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive loss (income) attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income attributable to ZK International Group Co., Ltd. Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income (loss): Earnings Per Share [Abstract] Basic and diluted earnings per share Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Equity Component [Domain] Common Stock [Member] Common Stock Additional Paid-in Capital [Member] Additional paid-in capital Retained Earnings, Appropriated [Member] Statutory surplus reserve Retained Earnings, Unappropriated [Member] Retained earnings Shares, Outstanding Balance (Shares) Balance (shares) Stock Issued During Period, Value, Other Shares issued to founders Stock Issued During Period, Shares, Other Shares issued to founders (Shares) Noncontrolling Interest, Increase from Subsidiary Equity Issuance Capital contributions by non-controlling interest Stock Issued During Period, Value, New Issues Shares issued for cast, net of offering costs Stock Issued During Period, Shares, New Issues Shares issued for cast, net of offering costs (Shares) Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Cash Flows from Operating Activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash used in operating activities: Depreciation Depreciation expense Amortization Amortization expense Provision for Doubtful Accounts Bad debt expense Deferred Income Tax Expense (Benefit) Deferred tax benefits Deferred Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Other Receivables Other receivables Increase (Decrease) in Notes Receivable, Current Notes receivable Increase (Decrease) in Inventories Inventories Increase (Decrease) in Materials and Supplies Advance to suppliers Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Accrued expenses and other current liabilities Increase (Decrease) in Employee Related Liabilities Accrued payroll and welfare Increase (Decrease) in Customer Advances Advance from customers Add: payment to suppliers Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Income tax payable Net Cash Provided by (Used in) Operating Activities Net cash provided (used in) operating activities Net cash used in operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash Flows from Investing Activities: Payments to Acquire Property, Plant, and Equipment Purchases of property, plant and equipment Payments to Acquire Intangible Assets Purchases of intangible assets Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash Flows from Financing activities: Proceeds from Issuance of Common Stock Net proceeds from issuance of shares Cash received from Share Issuances Proceeds from Noncontrolling Interests Capital contributions from non-controlling interest Proceeds from (Repayments of) Restricted Cash, Financing Activities Net proceeds released from (placed into) restricted cash Proceeds from (Repayments of) Short-term Debt Net proceeds (repayments) from short-term bank borrowings Proceeds from Notes Payable Proceeds from notes payable borrowings Repayments of Notes Payable Repayments on notes payable Effect of Exchange Rate on Cash and Cash Equivalents Effect of exchange rate changes on cash Cash and Cash Equivalents, Period Increase (Decrease) Net increase in cash and cash equivalents Increase in cash and cash equivalents Supplemental Cash Flow Information [Abstract] Supplemental disclosures of cash flows information: Supplemental Cash Flows Information: Income Taxes Paid Cash paid for income taxes Income tax paid Interest Paid, Net Cash paid for interest expenses Interest paid Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Title of Individual [Axis] Voting Rights [Axis] Relationship to Entity [Domain] HUANG Jian Cong [Member] WANG Ming Jie [Member] WANG Guo Lin [Member] WANG Jian Di [Member] WANG Yang Ming [Member] CHENG Kai Chun [Member] Ownership [Axis] Voting Rights [Domain] No Voting Right [Member] With Voting Right [Member] Consolidated Entities [Axis] Ownership [Domain] Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Consolidation, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] Foreign Currency Transactions and Translations Policy [Policy Text Block] Cash and Cash Equivalents, Unrestricted Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Receivables, Policy [Policy Text Block] Inventory, Policy [Policy Text Block] Advance to Suppliers and Advance from Customers Policy [Policy Text Block] The accounting policy for advance to Suppliers and Advance from Customers. Fair Value of Financial Instruments, Policy [Policy Text Block] Property, Plant and Equipment, Policy [Policy Text Block] Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Value-added Tax Policy [Policy Text Block] The accounting policy for value added tax. Revenue Recognition, Policy [Policy Text Block] Government Contractors, Policy [Policy Text Block] Research and Development Expense, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] Advertising Costs, Policy [Policy Text Block] Earnings Per Share, Policy [Policy Text Block] Concentration Risk, Credit Risk, Policy [Policy Text Block] Schedule of Variable Interest Entities [Table Text Block] Schedule of Differences between Reported Amount and Reporting Currency Denominated Amount [Table Text Block] Advance to Suppliers and Advance from Customers [Table Text Block] The tabular disclosure of advance to suppliers and advance from customers. Subsidiary of Limited Liability Company or Limited Partnership, Name of the Entity Represents the name of the subsidiary. Subsidiary of Limited Liability Company or Limited Partnership, State Subsidiary of Limited Liability Company or Limited Partnership, Date Subsidiary of Limited Liability Company or Limited Partnership, Registered Capital Represents the registered capital of a subsidiary. Subsidiary of Limited Liability Company or Limited Partnership, Business Purpose Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest Consolidated Entities [Domain] Subsidiary One [Member] Subsidiary Two [Member] Subsidiary Three [Member] Subsidiary Four [Member] Subsidiary Five [Member] ZK International [Member] ZK Pipe [Member] Wenzhou Weijia [Member] Zhejiang Zhengkang [Member] Foreign Currency Exchange Rate [Axis] Foreign Currency Exchange Rate [Domain] Foreign Currency Exchange Rate,Yearly [Member] Foreign Currency Exchange Rate,Averagely [Member] Foreign Currency Exchange Rate, Translation Increase (Decrease) in Prepaid Supplies Less: products or services received Payments to Suppliers Add: payment to suppliers Decrease in Customer Advances for Product and Services Delivered Less: products or services delivered The amount of decrease in customer advances due for product and services delivered. Proceeds from Deposits from Customers Add: payment from customers Property, Plant and Equipment, Type [Axis] Range [Axis] Property, Plant and Equipment, Type [Domain] Building [Member] Buildings Machinery and Equipment [Member] Machinery Furniture and Fixtures [Member] Vehicles [Member] Motor vehicles