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Earnings Per Share (Detail Textuals) - shares
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potential common stock shares not included in diluted earnings per share calculation 154,565 160,000 149,781 162,486