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v3.22.2

Note 1 - Summary of Significant Accounting Policies - Estimated Useful Lives of Various Classes of Assets (Details) | 12 Months Ended
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Mar. 31, 2022
Building [Member] |
Buildings (in years) (Year) | 20 years
Building [Member] | Minimum [Member] |
Buildings (in years) (Year) | 10 years
Building [Member] | Maximum [Member] |
Buildings (in years) (Year) | 15 years
Yard Improvements [Member] | Minimum [Member] |
Buildings (in years) (Year) | 5 years
Yard Improvements [Member] | Maximum [Member] |
Buildings (in years) (Year) | 15 years
Loaders and Other Rolling Stock [Member] | Minimum [Member] |
Buildings (in years) (Year) | 5 years
Loaders and Other Rolling Stock [Member] | Maximum [Member] |
Buildings (in years) (Year) | 15 years

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=frd_YardImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=frd_LoadersAndOtherRollingStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |