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Note 4 - Intangible Assets (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Finite Lived Intangible Assets [Line Items]          
Amortization of Intangible Assets $ 5   $ 5 $ 10 $ 10
Other Operating (Income) Expense [Member] | Silver Metal Mesh Development [Member]          
Finite Lived Intangible Assets [Line Items]          
Impairment of Intangible Assets, Finite-lived   $ 8      
Other Operating (Income) Expense [Member] | Trade Names [Member]          
Finite Lived Intangible Assets [Line Items]          
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   $ 5