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Net Income Per Share and Stockholders' Equity, Anti Dilution Table (Details)
3 Months Ended 9 Months Ended
Apr. 07, 2016
Sep. 30, 2018
shares
Sep. 30, 2017
shares
Sep. 30, 2018
shares
Sep. 30, 2017
shares
Dec. 31, 2017
shares
Apr. 22, 2016
shares
Antidilutive Securities Excluded from Computation of Earnings Per Share              
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   0 3,000 0 3,000    
Authorized number of shares of Series A Preferred Stock (shares)   5,000,000   5,000,000   5,000,000  
Series A Preferred Stock [Member]              
Antidilutive Securities Excluded from Computation of Earnings Per Share              
Preferred Stock, Rights Conversion Ratio into Preferred Stock 1            
Authorized number of shares of Series A Preferred Stock (shares)             900,000