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Net Income (Loss) Per Share, Basic and Diluted (Details 1) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Weighted average shares outstanding:        
Total 135,000 2,879,936 135,000 2,916,426
Common stock warrants        
Weighted average shares outstanding:        
Total 0 839,614 0 795,490
Options        
Weighted average shares outstanding:        
Total 135,000 2,040,322 135,000 2,120,936