For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

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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.

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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended			6 Months Ended	12 Months Ended
	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Steel Requirements [Member] \| Supplier Concentration Risk [Member] \| Three Largest Suppliers [Member]
Concentration Risk, Percentage					51.00%	43.00%	42.00%
Sales Revenue, Goods, Net [Member] \| Customer Concentration Risk [Member] \| Top 20 [Member]
Concentration Risk, Percentage					31.00%	29.00%	30.00%
Sales Revenue, Goods, Net [Member] \| Customer Concentration Risk [Member] \| Largest Customer [Member]
Concentration Risk, Percentage					6.00%	6.00%	5.00%
Sales Revenue, Goods, Net [Member] \| Customer Concentration Risk [Member] \| Industrial Machinery and Equipment Manufacturers and Fabricators [Member]
Concentration Risk, Percentage					49.00%	51.00%	50.00%
Sales Revenue, Goods, Net [Member] \| Product Concentration Risk [Member] \| Engineered Products [Member]
Concentration Risk, Percentage					1.80%	1.70%	1.90%
Minimum [Member]
Property, Plant and Equipment, Useful Life					2 years
Maximum [Member]
Property, Plant and Equipment, Useful Life					30 years
Trade Names [Member]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)		$ 8,000,000
Tubular And Pipe Products [Member]
Goodwill, Impairment Loss		$ 16,451,000	$ 23,836,000	$ 16,500,000	$ 16,451,000	$ 23,836,000
Specialty Metal Flat Products [Member]
Goodwill, Impairment Loss	$ 500,000				$ 500,000
Impairment of Long-Lived Assets Held-for-use	0
Number of Reportable Segments					3
LIFO Inventory Amount	$ 42,700,000		$ 46,600,000		$ 42,700,000	$ 46,600,000
Percentage of LIFO Inventory	20.70%		15.00%		20.70%	15.00%
Goodwill, Impairment Loss					$ 16,951,000	$ 23,836,000