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Earnings Per Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share (Textual)        
Warrants shares are excluded from calculations of dilutive net income per share 820,312 820,312 820,312 820,312