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Note 1 - Summary of Significant Accounting Policies (Details) (USD $)
0 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2015
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]            
Number of Reportable Segments     2us-gaap_NumberOfReportableSegments      
LIFO Inventory Amount (in Dollars) $ 46,600,000us-gaap_LIFOInventoryAmount $ 46,600,000us-gaap_LIFOInventoryAmount $ 46,600,000us-gaap_LIFOInventoryAmount $ 43,900,000us-gaap_LIFOInventoryAmount    
Percentage of LIFO Inventory 15.00%us-gaap_PercentageOfLIFOInventory 15.00%us-gaap_PercentageOfLIFOInventory 15.00%us-gaap_PercentageOfLIFOInventory 15.30%us-gaap_PercentageOfLIFOInventory    
Goodwill, Impairment Loss (in Dollars) $ 23,800,000us-gaap_GoodwillImpairmentLoss $ 23,836,000us-gaap_GoodwillImpairmentLoss $ 23,836,000us-gaap_GoodwillImpairmentLoss [1]    [1] $ 6,583,000us-gaap_GoodwillImpairmentLoss [1]  
Engineered Products [Member] | Sales Revenue, Goods, Net [Member]            
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]            
Concentration Risk, Percentage     1.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ProductOrServiceAxis
= zeus_EngineeredProductsMember
1.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ProductOrServiceAxis
= zeus_EngineeredProductsMember
1.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ProductOrServiceAxis
= zeus_EngineeredProductsMember
 
Scenario, Forecast [Member]            
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]            
Number of Reportable Segments           3us-gaap_NumberOfReportableSegments
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Sales Revenue, Goods, Net [Member] | Largest Customer [Member]            
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]            
Concentration Risk, Percentage     6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_CounterpartyNameAxis
= zeus_LargestCustomerMember
5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_CounterpartyNameAxis
= zeus_LargestCustomerMember
4.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_CounterpartyNameAxis
= zeus_LargestCustomerMember
 
Sales Revenue, Goods, Net [Member] | Three Largest U.S. Automobile Manufacturers [Member]            
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]            
Concentration Risk, Percentage     51.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_CounterpartyNameAxis
= zeus_ThreeLargestUSAutomobileManufacturersMember
50.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_CounterpartyNameAxis
= zeus_ThreeLargestUSAutomobileManufacturersMember
50.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_CounterpartyNameAxis
= zeus_ThreeLargestUSAutomobileManufacturersMember
 
Sales Revenue, Goods, Net [Member]            
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]            
Concentration Risk, Percentage     29.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
30.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
31.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
 
Minimum [Member]            
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]            
Property, Plant and Equipment, Useful Life     2 years      
Maximum [Member]            
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]            
Property, Plant and Equipment, Useful Life     30 years      
Steel Requirements [Member]            
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]            
Concentration Risk, Percentage     43.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= zeus_SteelRequirementsMember
42.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= zeus_SteelRequirementsMember
44.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= zeus_SteelRequirementsMember
 
[1] The goodwill impairment in 2014 related to the tubular and pipe products segment. The goodwill impairment in 2012 related the to flat products segment's Southern region.