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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Mar. 31, 2021
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
Column A |  | Column B |  |  | Column C |  |  | Column D |  |  | Column E |
|  |  |  |  |  | Additions |  |  |  |  |  |  |  |  |
Description |  | Balance at |  |  | Charged to |  |  | Charged to |  |  |  |  |  |  |  |  |
|  | Beginning |  |  | Costs and |  |  | Other Accounts— |  |  | Deductions— |  |  | Balance at |
|  | of Period |  |  | Expenses |  |  | Describe(A) |  |  | Describe(B) |  |  | End of Period |
Year ended March 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts receivable and cash discounts (deducted from related asset account) |  | $ | 82,417 |  |  | $ | — |  |  | $ | 351,270 |  |  | $ | 400,853 |  |  | $ | 32,834 |
Year ended March 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts receivable and cash discounts (deducted from related asset account) |  | $ | 29,178 |  |  | $ | — |  |  | $ | 677,652 |  |  | $ | 624,413 |  |  | $ | 82,417 |
(A) | Allowance for doubtful accounts charged to bad debt expense of $0 and $53,239 during fiscal years 2021 and 2020 , respectively. Cash discounts allowed on sales and charged against revenue of $351,270 and $624,413 during fiscal years 2021 and 2020 , respectively.
(B) | Accounts receivable written off of $49,583 and $0 during fiscal years 2021 and 2020 , respectively. Cash discounts taken on sales of $351,270 and $624,413 during fiscal years 2021 and 2020 , 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 http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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