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Note 12 - Retirement Plan (Details Textual) - Friedman Industries, Inc. Employee's Retirement and 401(k) Plan [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Employee Service Vesting Period (Year) | 6 years |
Maximum Annual Contribution Percentage to Defined Contribution Plan for Eligible Employee Compensation |  | 15.00%
Defined Contribution Plan, Cost | $ 0.4 | $ 0.2
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 0.1 |

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