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Summary of Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
Bank
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2001
USD ($)
Mar. 20, 2015
USD ($)
Dec. 31, 2012
USD ($)
Business acquisition:            
Goodwill $ 2,403,000 $ 1,097,000        
Goodwill, Impairment Loss 0 0 $ 0      
Billed contracts receivable 21,967,000 10,407,000        
Costs incurred on uncompleted contracts 19,696,000 2,339,000        
Tooling in progress $ 2,271,000 8,068,000        
Number of banks in which cash is held | Bank 1          
Cash and cash equivalents $ 8,943,000 2,312,000 2,266,000     $ 7,838,000
Allowance for doubtful accounts 40,000 289,000        
Allowance for chargebacks 523,000 813,000        
Allowance for slow moving and obsolete inventory 863,000 940,000        
Self-insurance reserve 1,074,000 1,165,000        
Postemployment Benefits Liability 9,006,000 9,172,000        
Research and development expense 719,000 475,000 466,000      
Foreign Currency Transaction Gain (Loss), before Tax 54,000 $ (108,000) $ (27,000)      
CPI [Member]            
Business acquisition:            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill         $ 650,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment         $ 12,474,000  
Goodwill, acquired during period $ 1,306,000          
Airshield Corporation            
Business acquisition:            
Goodwill, acquired during period       $ 1,097,000