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Net Income Per Share and Stockholders' Equity, Anti Dilution Table (Details)
3 Months Ended
Apr. 07, 2016
Mar. 31, 2019
shares
Mar. 31, 2018
shares
Dec. 31, 2018
shares
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   4,000 0  
Authorized number of shares of Series A Preferred Stock (shares)   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