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Schedule of Stock by Class (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Common shares, $0.01 par value (in shares) 28,167,408us-gaap_CommonStockSharesOutstanding 28,167,248us-gaap_CommonStockSharesOutstanding
Common shares, $0.01 par value $ 282us-gaap_CommonStockValue $ 282us-gaap_CommonStockValue
Class N preferred shares, $10.00 par value $ 6us-gaap_PreferredStockValue $ 6us-gaap_PreferredStockValue
Class N preferred shares, $10.00 par value (in shares) 575us-gaap_PreferredStockSharesOutstanding 579us-gaap_PreferredStockSharesOutstanding
Preferred Class N [Member]    
Class N preferred shares, $10.00 par value (in shares) 575us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= hgbl_PreferredClassNMember
579us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= hgbl_PreferredClassNMember