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Earnings Per Share - Basic and diluted earnings per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator:        
Net income $ 344 $ 1,970 $ 1,157 $ 4,873
Less: Allocation of earnings to participating securities (4) (26) (14) (57)
Net income allocated to common stock 340 1,944 1,143 4,816
Basic earnings per share computation:        
Net income allocated to common stock $ 340 $ 1,944 $ 1,143 $ 4,816
Weighted average common shares outstanding, including shares considered participating securities 7,847 7,774 7,834 7,763
Less: Weighted average participating securities outstanding (106) (102) (98) (91)
Weighted average shares of common stock 7,741 7,672 7,736 7,672
Basic earnings per share (in dollars per share) $ 0.04 $ 0.25 $ 0.15 $ 0.63
Diluted earnings per share computation:        
Net income allocated to common stock $ 340 $ 1,944 $ 1,143 $ 4,816
Undistributed earnings re-allocated to participating securities 0 0 0 0
Numerator for diluted earnings per share $ 340 $ 1,944 $ 1,143 $ 4,816
Weighted average common shares outstanding for basic earnings per share 7,741 7,672 7,736 7,672
Incremental shares from stock options 45 61 48 61
Weighted average shares and dilutive potential common shares 7,786 7,733 7,784 7,733
Diluted earnings per share $ 0.04 $ 0.25 $ 0.15 $ 0.62