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Note 4 - Inventories (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Dec. 31, 2023
LIFO Inventory Amount | $ 32.3 |  | $ 32.3 | $ 38.2
Percentage of LIFO Inventory | 8.40% |  | 8.40% | 9.90%
Inventory, LIFO Reserve, Effect on Income, Net | $ (1.0) | $ (1.0) | $ (0.6) |
Inventory Difference Using FIFO Basis | $ 11.4 |  | $ 11.4 | $ 12.0

X
- Definition The difference between the change in the inventory reserve representing the cumulative difference in cost between the first in, first out and the last in, first out inventory valuation methods and any LIFO decrement which have been reflected in the statement of income during the period. + References No definition available. + Details
Name: | us-gaap_InventoryLIFOReserveEffectOnIncomeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483489/210-10-50-1 + Details
Name: | us-gaap_LIFOInventoryAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent. + References No definition available. + Details
Name: | us-gaap_PercentageOfLIFOInventory
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The difference in inventory balance if costed on a FIFO basis compared to LIFO basis. + References No definition available. + Details
Name: | zeus_InventoryDifferenceUsingFIFOBasis
Namespace Prefix: | zeus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant