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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Bank
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Selling, general and administrative expenses
Dec. 31, 2011
Selling, general and administrative expenses
Dec. 31, 2001
Airshield Corporation
Accounting Policies [Abstract]            
Tooling in progress, net liability $ 3          
Billed contracts receivable 6,624 8,270        
Costs incurred on uncompleted contracts 6,621 6,750        
Tooling in progress 3 1,520        
Number of banks in which cash is held 1          
Cash and cash equivalents 7,838 4,634 5,657      
Allowance for doubtful accounts 258 236        
Allowance for chargebacks 984 1,283        
Allowance for slow moving and obsolete inventory 987 862        
Self-insurance reserve 1,065 1,045        
Components of accumulated other comprehensive income:            
Interest rate swaps (54) (109)        
Post retirement benefits 3,241 3,986        
Total 3,187 3,877        
Research and development expense 449 400        
Business acquisition:            
Goodwill, acquired during period           1,097
Foreign currency transaction losses       $ 4 $ 132