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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Mar. 31, 2022
Notes to Financial Statements |
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS FRIEDMAN INDUSTRIES, INCORPORATED
Description |  | Balance at |  |  |  |  |  |  |  |  |  |  |  |
|  | Beginning |  |  |  |  |  |  |  |  | Balance at |
|  | of Period |  |  | Additions (A) |  |  | Deductions (B) |  |  | End of Period |
Year ended March 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts receivable (deducted from related asset account) |  | $ | 17,834 |  |  | $ | 66,985 |  |  | $ | — |  |  | $ | 84,819 |
Year ended March 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts receivable (deducted from related asset account) |  | $ | 67,417 |  |  | $ | — |  |  | $ | (49,583 | ) |  | $ | 17,834 |
(A) | Additions consist of charges to bad debt expense of $66,985 and $0 during fiscal years 2022 and 2021, respectively.
(B) | Deductions consist of accounts receivable written off of $0 and $49,583 during fiscal years 2022 and 2021, respectively.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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