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Net Income per Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net Income per Share (Textual)        
Shares not included in the computation of diluted net income per share 707,818 1,045,468 707,818 1,056,808
Unvested restricted stock       79,286