| Form N-CSR Cover | 12 Months Ended |
| May 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 |
| Trading Symbol | nlfiv |
| Document Period End Date | May 31, 2024 |
| Shareholder Report | 12 Months Ended |
| May 31, 2024 USD ($) Integer | |
| 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 | May 31, 2024 |
| Trading Symbol | nlfiv |
| Expenses [Text Block] | What were the Funds costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $286 2.86% |
| Line Graph [Table Text Block] | LGM Risk Managed Total Return Fund - Institutional Class S&P 500® Index Bloomberg Global Aggregate Index 12-06-2017 10000 10000 10000 31-05-2018 11374 11350 10166 31-05-2019 11264 11779 10481 31-05-2020 10706 13292 11067 31-05-2021 10938 18651 11561 31-05-2022 11199 18595 10034 31-05-2023 11175 19138 9584 31-05-2024 12800 24532 9659 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns Since Inception 1 Year 5 Years (6/12/2017) LGM Risk Managed Total Return Fund - 14.54% 2.59% 3.61% Institutional Class S&P 500 ® 28.19% 15.80% 13.75% Bloomberg Global Aggregate Index 0.77% -1.62% -0.50% The Funds 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. |
| Additional Fund Statistics [Text Block] | Fund Statistics Net Assets $13,037,022 Number of Portfolio Holdings 2 Advisory Fee $129,026 Portfolio Turnover 355% |
| Holdings [Text Block] | Asset Weighting (% of total investments) Exchange-Traded Funds 48.20% Money Market Funds 51.80% Top 10 Holdings (% of net assets) Holding Name % of Net Morgan Stanley Institutional Liquidity - Treasury Portfolio, Institutional Class 52.2% SPDR S&P 500 ETF Trust 48.5% |
| Largest Holdings [Text Block] | Top 10 Holdings (% of net assets) Holding Name % of Net Morgan Stanley Institutional Liquidity - Treasury Portfolio, Institutional Class 52.2% SPDR S&P 500 ETF Trust 48.5% |
| Material Fund Change [Text Block] | Material Fund Changes No material changes occurred during the year ended May 31, 2024. |
| LGM Risk Managed Total Return Fund Institutional Class | |
| Shareholder Report [Line Items] | |
| Fund Name | LGM Risk Managed Total Return Fund |
| Class Name | Institutional Class |
| Trading Symbol | LBETX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about LGM Risk Managed Total Return Fund for the period of June 1, 2023 to May 31, 2024. |
| Additional Information [Text Block] | You can find additional information about the Fund at www.LGMCapitalmanagement.com 1-844-655-9371 |
| Additional Information Phone Number | 1-844-655-9371 |
| Additional Information Website | www.LGMCapitalmanagement.com |
| Expenses Paid, Amount | $ 286 |
| Expense Ratio, Percent | 2.86% |
| 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. |
| Net Assets | $ 13,037,022 |
| Holdings Count | Integer | 2 |
| Advisory Fees Paid, Amount | $ 129,026 |
| Investment Company, Portfolio Turnover | 355% |
| Shareholder Report, Line Graph (Details) - USD ($) | May 31, 2024 | May 31, 2023 | May 31, 2022 | May 31, 2021 | May 31, 2020 | May 31, 2019 | May 31, 2018 | Jun. 12, 2017 |
| LGM Risk Managed Total Return Fund Institutional Class | ||||||||
| Account Value [Line Items] | ||||||||
| Account Value | $ 12,800 | $ 11,175 | $ 11,199 | $ 10,938 | $ 10,706 | $ 11,264 | $ 11,374 | $ 10,000 |
| S&P 500 Index [Member] | ||||||||
| Account Value [Line Items] | ||||||||
| Account Value | 24,532 | 19,138 | 18,595 | 18,651 | 13,292 | 11,779 | 11,350 | 10,000 |
| Bloomberg Global Aggregate Index [Member] | ||||||||
| Account Value [Line Items] | ||||||||
| Account Value | $ 9,659 | $ 9,584 | $ 10,034 | $ 11,561 | $ 11,067 | $ 10,481 | $ 10,166 | $ 10,000 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 60 Months Ended | 84 Months Ended |
| May 31, 2024 | May 31, 2024 | May 31, 2024 | |
| LGM Risk Managed Total Return Fund Institutional Class | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 14.54% | 2.59% | 3.61% |
| S&P 500 Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 28.19% | 15.80% | 13.75% |
| Bloomberg Global Aggregate Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 0.77% | (1.62%) | (0.50%) |
| Shareholder Report, Holdings (Details) | May 31, 2024 |
| LGM Risk Managed Total Return Fund Institutional Class | Money Market Funds Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 52.20% |
| LGM Risk Managed Total Return Fund Institutional Class | Equity Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 48.50% |
| LGM Risk Managed Total Return Fund Institutional Class | Liabilitiesin Excessof Other Assets Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | (0.70%) |
| Essential 40 Stock Fund Class I Shares | Morgan Stanley Institutional Liquidity Treasury Portfolio Institutional Class [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Essential 40 Stock Fund Class I Shares | S P D R S And P 500 E T F Trust [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 48.50% |
| Essential 40 Stock Fund Class I Shares | Exchange Traded Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 48.20% |
| Essential 40 Stock Fund Class I Shares | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 51.80% |
