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Related Party Transactions (Detail Textuals) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Marine Products
     
Related Party Transaction [Line Items]      
Spinoff transaction percentage 100.00%    
Marine Products | Transition Support Services Agreement
     
Related Party Transaction [Line Items]      
Aggregate amount of services received $ 544,000 $ 639,000 $ 689,000
Due from related parties during the current period 94,000 3,000  
Other
     
Related Party Transaction [Line Items]      
Products or services from suppliers 1,676,000 1,469,000 551,000
Administrative services and rent $ 83,000 $ 102,000 $ 94,000
Company's voting power held by group excess of fifty percent