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Note 6 - Derivative Financial Instruments - Gain (Loss) Recognized in Earnings for Derivative Instruments (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Hot-rolled coil steel contracts | $ (1,216,500) | $ (0)
Nonoperating Income (Expense) [Member] |  |
Hot-rolled coil steel contracts | (11,636,120) |
Nonoperating Income (Expense) [Member] | Hot-rolled Coil Steel Contracts [Member] |  |
Hot-rolled coil steel contracts | $ (11,636,120) | $ (515,160)

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Details
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- Details
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Balance Type: |
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