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Consolidated Balance Sheets (Parentheticals) - USD ($) | Mar. 31, 2021 | Mar. 31, 2020
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Allowances for bad debts and cash discounts | $ 32,834 | $ 82,417
Treasury stock, shares (in shares) | 1,435,248 | 1,225,716

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible and for discounts provided for cash payments. + References No definition available. + Details
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Namespace Prefix: | frd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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Period Type: | instant