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Note 1 - Summary of Significant Accounting Policies - Estimated Useful Lives of Various Classes of Assets (Details) | Mar. 31, 2024
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Minimum [Member] | Building [Member] |
Property, Plant and Equipment, Useful Life (Year) | 20 years
Minimum [Member] | Machinery and Equipment [Member] |
Property, Plant and Equipment, Useful Life (Year) | 10 years
Minimum [Member] | Yard Improvements [Member] |
Property, Plant and Equipment, Useful Life (Year) | 5 years
Minimum [Member] | Loaders and Other Rolling Stock [Member] |
Property, Plant and Equipment, Useful Life (Year) | 5 years
Maximum [Member] | Building [Member] |
Property, Plant and Equipment, Useful Life (Year) | 40 years
Maximum [Member] | Machinery and Equipment [Member] |
Property, Plant and Equipment, Useful Life (Year) | 35 years
Maximum [Member] | Yard Improvements [Member] |
Property, Plant and Equipment, Useful Life (Year) | 15 years
Maximum [Member] | Loaders and Other Rolling Stock [Member] |
Property, Plant and Equipment, Useful Life (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: | instant

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

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
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: |

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