| Form N-CSR Cover | 6 Months Ended |
| Aug. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Northern Lights Fund Trust IV |
| Entity Central Index Key | 0001644419 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Aug. 31, 2024 |
| Shareholder Report | 6 Months Ended | 120 Months Ended |
| Aug. 31, 2024 USD ($) Holding | Aug. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | ||
| Document Type | N-CSRS | |
| Amendment Flag | false | |
| Registrant Name | Northern Lights Fund Trust IV | |
| Entity Central Index Key | 0001644419 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Aug. 31, 2024 | |
| C000232649 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | FM Focus Equity ETF | |
| Trading Symbol | FMCX | |
| Security Exchange Name | NYSEArca | |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-888-530-2448 | |
| Additional Information Website | www.FMCX.com | |
| Expenses [Text Block] | What were the Fund’s costs for the last six months? (based on a hypothetical $10,000 investment) Fund Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment FM Focus Equity ETF $37 0.70% Footnote Reference * Annualized | |
| Expenses Paid, Amount | $ 37 | |
| Expense Ratio, Percent | 0.70% | |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of how the Fund will perform in the future. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns Name 6 months 1 Year Since Inception (April 22, 2022) FM Focus Equity ETF - NAV 8.05% 22.36% 9.70% FM Focus Equity ETF - Market Price 8.08% 22.42% 9.71% S&P 500 ® 11.59% 27.14% 14.39% The Fund's past performance is not a good predictor of how the Fund will perform in the future. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |
| Performance Inception Date | Apr. 22, 2022 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |
| AssetsNet | $ 97,572,539 | $ 97,572,539 |
| Holdings Count | Holding | 30 | 30 |
| Advisory Fees Paid, Amount | $ 325,335 | |
| InvestmentCompanyPortfolioTurnover | 26% | |
| Additional Fund Statistics [Text Block] | Fund Statistics Net Assets $97,572,539 Number of Portfolio Holdings 30 Advisory Fee $325,335 Portfolio Turnover 26% | |
| Holdings [Text Block] | Asset Weighting (% of total investments) Value Value Common Stocks 94.8% Money Market Funds 2.1% Reit 3.1% |
| Shareholder Report, Line Graph (Details) - USD ($) | Apr. 22, 2022 | Aug. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 |
| C000232649 | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | FM Focus Equity ETF | ||||||||||
| Account Value | $ 10,000 | $ 12,440 | $ 11,754 | $ 11,845 | $ 10,898 | $ 9,701 | $ 10,191 | $ 9,419 | $ 8,938 | $ 8,408 | $ 8,892 |
| S&P 500 Index | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | ®</sup> Index" id="sjs-B8">S&P 500<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup> Index | ||||||||||
| Account Value | $ 10,000 | $ 13,732 | $ 13,246 | $ 12,701 | $ 11,489 | $ 10,286 | $ 10,634 | $ 9,779 | $ 9,097 | $ 8,458 | $ 8,892 |
| Shareholder Report, Average Annual Return (Details) | 6 Months Ended | 12 Months Ended | 28 Months Ended | |
| Apr. 22, 2022 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | |
| C000232649 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | FM Focus Equity ETF | |||
| Without Sales Load [Member] | C000232649 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 8.05% | 22.36% | 9.70% | |
| S&P 500 Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ®</sup> Index" id="sjs-B11">S&P 500<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup> Index | |||
| Average Annual Return, Percent | 11.59% | 27.14% | 14.39% | |
| FM Focus Equity ETF - Market Price | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 8.08% | 22.42% | 9.71% |
| Shareholder Report, Holdings (Details) - C000232649 | Aug. 31, 2024 |
| 48251W104 | KKR & Company, Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| 594918104 | Microsoft Corporation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| 29109X106 | Aspen Technology, Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| 084670108 | Berkshire Hathaway, Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| 653656108 | Nice Ltd. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| 548661107 | Lowe's Companies, Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| 874054109 | Take-Two Interactive Software, Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| 79466L302 | Salesforce, Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| 92338C103 | Veralto Corporation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| 369604301 | General Electric Company | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Consumer Staples | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Money Market Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Real Estate | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Materials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Communications | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.80% |
| Industrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.60% |
| Financials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39.40% |
| InvestmentType_Common Stocks | |
| Holdings [Line Items] | |
| Percent of Total Investments | 94.80% |
| InvestmentType_Money Market Funds | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| InvestmentType_Reit | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
