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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Bank
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
Selling, general and administrative expenses
Dec. 31, 2012
Selling, general and administrative expenses
Dec. 31, 2001
Airshield Corporation
Accounting Policies [Abstract]              
Tooling in progress, net liability $ 334            
Billed contracts receivable 3,344 6,624          
Costs incurred on uncompleted contracts 3,010 6,621          
Tooling in progress 334 3          
Number of banks in which cash is held 1            
Cash and cash equivalents 2,266 7,838   4,634      
Allowance for doubtful accounts 141 258          
Allowance for chargebacks 973 984          
Allowance for slow moving and obsolete inventory 792 987          
Self-insurance reserve 1,092 1,065          
Components of accumulated other comprehensive income:              
Total 4,872 3,187 3,877        
Research and development expense 466 449          
Business acquisition:              
Goodwill, acquired during period             1,097
Foreign currency transaction losses         $ 27 $ 4