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Significant Accounting Policies (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Acquired Indefinite-lived Intangible Assets [Line Items]      
Business base percentage, prime contracts 95.00%    
Business base percentage, subcontracts 5.00%    
Goodwill $ 25,989,000   $ 26,000,000
Goodwill impairment     0
Uncertain tax positions 0   $ 0
Income tax interest expense 0 $ 0  
Income tax penalties 0 $ 0  
Cash, FDIC insured amount $ 250,000,000    
Employee Stock Option      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Number of awards authorized for issuance (in shares) 0    
Expiration term of share-based compensation plan 10 years    
Employee Stock Option | Long Term Incentive Plan 2006 [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Number of awards authorized for issuance (in shares) 0    
Expiration term of share-based compensation plan 10 years    
Minimum      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Estimated useful of long-lived assets 3 years    
Maximum      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Estimated useful of long-lived assets 7 years