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Basic and Diluted Net Income / (Loss) Per Share - Schedule of Reconciliation of Basic and Diluted Income Per Share Computations (Details) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Per share - net income/(loss):    
Basic:: Weighted average shares outstanding 6,136,000 6,237,000
Diluted: Weighted average shares outstanding 6,136,000 6,237,000
Diluted: Weighted average effects of dilutive securities 95,000
Diluted: Total 6,231,000 6,237,000
Antidilutive securities: 52,000