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Note 10 - Segment Information - Percentages of Property, Plant and Equipment by Geographic Areas (Details) | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Property, plant and equipment | 100.00% | 100.00%
UNITED STATES |  |
Property, plant and equipment | 95.00% | 94.00%
International [Member] |  |
Property, plant and equipment | 5.00% | 6.00%

X
- Definition The percentage of total physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References No definition available. + Details
Name: | mrc_PercentageOfFixedAssets
Namespace Prefix: | mrc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=mrc_InternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |