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Note 4 - Cash and cash equivalent (Details) - Cash and cash equivalents (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Cash and Cash Equivalents [Abstract]        
Cash $ 740 $ 893    
Bank deposit 2,652 4,590    
$ 3,392 $ 5,483 $ 8,572 $ 10,695