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Investments (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Equity in earnings of investees $ 97 $ 1,808 $ 236 $ 3,724  
Psteletronicaltda [Member]
         
Equity Method Investment, Ownership Percentage         50.00%
Equity in earnings of investees   1,595   3,104  
Noncontrolling Interest, Ownership Percentage by Parent 74.00%   74.00%    
Minda Stoneridge Instruments Ltd [Member]
         
Equity Method Investment, Ownership Percentage 49.00%   49.00%    
Equity Method Investments 6,303   6,303   6,391
Equity in earnings of investees $ 97 $ 213 $ 236 $ 620