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Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Stockholders' equity:    
Series A Preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Series A Preferred stock, authorized shares 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized
Series A Preferred stock, issued shares 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Series A Preferred stock, outstanding shares 0us-gaap_PreferredStockSharesOutstanding  
Series B Preferred stock, par value $ 0.01UAMY_SeriesBPreferredStockSharesParValue $ 0.01UAMY_SeriesBPreferredStockSharesParValue
Series B Preferred stock, authorized shares 10,000,000UAMY_SeriesBPreferredStockAuthorizedShares 10,000,000UAMY_SeriesBPreferredStockAuthorizedShares
Series B Preferred stock, issued shares 750,000UAMY_SeriesBPreferredStockIssuedShares 750,000UAMY_SeriesBPreferredStockIssuedShares
Series B Preferred stock, outstanding shares 750,000UAMY_SeriesBPreferredStockOutstandingShares 750,000UAMY_SeriesBPreferredStockOutstandingShares
Series B liquidation preference $ 900,000UAMY_SeriesBLiquidationPreference $ 892,500UAMY_SeriesBLiquidationPreference
Series C Preferred stock, par value $ 0.01UAMY_SeriesCPreferredStockSharesParValue $ 0.01UAMY_SeriesCPreferredStockSharesParValue
Series C Preferred stock, authorized shares 10,000,000UAMY_SeriesCPreferredStockAuthorizedShares 10,000,000UAMY_SeriesCPreferredStockAuthorizedShares
Series C Preferred stock, issued shares 177,904UAMY_SeriesCPreferredStockIssuedShares 177,904UAMY_SeriesCPreferredStockIssuedShares
Series C Preferred stock, outstanding shares 177,904UAMY_SeriesCPreferredStockOutstandingShares 177,904UAMY_SeriesCPreferredStockOutstandingShares
Series C liquidation preference 97,847UAMY_SeriesCLiquidationPreference 97,847UAMY_SeriesCLiquidationPreference
Series D Preferred stock, par value $ 0.01UAMY_SeriesDPreferredStockSharesParValue $ 0.01UAMY_SeriesDPreferredStockSharesParValue
Series D Preferred stock, authorized shares 10,000,000UAMY_SeriesDPreferredStockAuthorizedShares 10,000,000UAMY_SeriesDPreferredStockAuthorizedShares
Series D Preferred stock, issued shares 1,751,005UAMY_SeriesDPreferredStockIssuedShares 1,751,005UAMY_SeriesDPreferredStockIssuedShares
Series D Preferred stock, outstanding shares 1,751,005UAMY_SeriesDPreferredStockOutstandingShares 1,751,005UAMY_SeriesDPreferredStockOutstandingShares
Series D liquidation preference $ 4,837,880UAMY_SeriesDLiquidationPreference $ 4,796,731UAMY_SeriesDLiquidationPreference
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, authorized shares 90,000,000us-gaap_CommonStockSharesAuthorized 90,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued shares 66,216,278us-gaap_CommonStockSharesIssued 66,027,453us-gaap_CommonStockSharesIssued
Common stock, outstanding shares 66,216,278us-gaap_CommonStockSharesOutstanding 66,027,453us-gaap_CommonStockSharesOutstanding