| Form N-CSR Cover | 12 Months Ended |
| Oct. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| 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 | Oct. 31, 2024 |
| Shareholder Report | 12 Months Ended | 120 Months Ended |
| Oct. 31, 2024 USD ($) Holding | Oct. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | ||
| Document Type | N-CSR | |
| 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 | Oct. 31, 2024 | |
| C000237474 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Main BuyWrite ETF | |
| Trading Symbol | BUYW | |
| Security Exchange Name | CboeBZX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Main BuyWrite ETF for the period of November 1, 2023 to October 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.mainmgtetfs.com/buyw/ | |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |
| Additional Information Phone Number | 1-866-383-9778 | |
| Additional Information Website | https://www.mainmgtetfs.com/buyw/ | |
| Expenses [Text Block] | What were the Fund’s costs for the last year? (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 Main BuyWrite ETF $110 1.04% | |
| Expenses Paid, Amount | $ 110 | |
| Expense Ratio, Percent | 1.04% | |
| 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 1 Year 5 years Since Inception (December 29, 2015) Main BuyWrite ETF - NAV 11.18% 7.27% 5.44% S&P 500 ® 38.02% 15.27% 14.12% 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 | Dec. 29, 2015 | |
| 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 | $ 551,371,164 | $ 551,371,164 |
| Holdings Count | Holding | 14 | 14 |
| Advisory Fees Paid, Amount | $ 4,016,672 | |
| InvestmentCompanyPortfolioTurnover | 31% | |
| Additional Fund Statistics [Text Block] | Fund Statistics Net Assets $551,371,164 Number of Portfolio Holdings 14 Advisory Fee (net of waivers) $4,016,672 Portfolio Turnover 31% | |
| Holdings [Text Block] | Asset Weighting (% of total investments) Value Value Exchange-Traded Funds 100.0% |
| Shareholder Report, Line Graph (Details) - USD ($) | Dec. 29, 2015 | Oct. 31, 2024 | Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016 |
| C000237474 | ||||||||||
| Account Value [Line Items] | ||||||||||
| Line Graph and Table Measure Name | Main BuyWrite ETF | |||||||||
| Account Value | $ 10,000 | $ 15,969 | $ 14,364 | $ 12,595 | $ 12,835 | $ 10,570 | $ 11,241 | $ 10,720 | $ 10,824 | $ 10,025 |
| 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 | $ 32,154 | $ 23,297 | $ 21,152 | $ 24,771 | $ 17,333 | $ 15,799 | $ 13,819 | $ 12,873 | $ 10,413 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 60 Months Ended | 106 Months Ended | |
| Dec. 29, 2015 | Oct. 31, 2024 | Oct. 31, 2024 | Oct. 31, 2024 | |
| C000237474 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Main BuyWrite ETF | |||
| Without Sales Load [Member] | C000237474 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 11.18% | 7.27% | 5.44% | |
| 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 | 38.02% | 15.27% | 14.12% |
| Shareholder Report, Holdings (Details) - C000237474 | Oct. 31, 2024 |
| 78462F103 | SPDR S&P 500 ETF Trust | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.70% |
| 92189F676 | VanEck Semiconductor ETF | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.30% |
| 81369Y852 | Communication Services Select Sector SPDR Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.70% |
| 46138G649 | Invesco Nasdaq 100 ETF | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.20% |
| 81369Y886 | Utilities Select Sector SPDR Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.80% |
| 81369Y407 | Consumer Discretionary Select Sector SPDR Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.10% |
| XLY C190_20241223_S_CEX | Consumer Discretionary Select Sector SPDR Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.30%) |
| XLY C190_20250623_S_CEX | Consumer Discretionary Select Sector SPDR Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.50%) |
| QQQM C172_20241223_S_CEX | Invesco Nasdaq 100 ETF | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.80%) |
| XLU C69_20250623_S_CEX | Utilities Select Sector SPDR Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.90%) |
| SPY C460_20241223_S_CEXEquity Option | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (19.50%) |
| 81369Y407Equity | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 118.80% |
| InvestmentType_Exchange-Traded Funds | |
| Holdings [Line Items] | |
| Percent of Total Investments | 100% |
