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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 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Numerator:        
Net income (loss) $ (2,898) $ 1,606 $ (1,741) $ 6,479
Less: Allocation of earnings (loss) to participating securities 40 (22) 23 (76)
Net income (loss) allocated to common stock (2,858) 1,584 (1,718) 6,403
Basic earnings (loss) per share computation:        
Net income (loss) allocated to common stock $ (2,858) $ 1,584 $ (1,718) $ 6,403
Weighted average common shares outstanding, including shares considered participating securities 7,910 7,697 7,876 7,763
Less: Weighted average participating securities outstanding (110) (107) (102) (91)
Weighted average shares of common stock 7,800 7,590 7,774 7,672
Basic earnings (loss) per share $ (0.37) $ 0.21 $ (0.22) $ 0.83
Diluted earnings (loss) per share computation:        
Net income (loss) allocated to common stock $ (2,858) $ 1,584 $ (1,718) $ 6,403
Undistributed earnings re-allocated to participating securities 0 0 0 0
Numerator for diluted earnings (loss) per share $ (2,858) $ 1,584 $ (1,718) $ 6,403
Weighted average common shares outstanding for basic earnings (loss) per share 7,800 7,590 7,774 7,672
Incremental shares from stock options   60   60
Weighted average shares and dilutive potential common shares 7,800 7,650 7,774 7,732
Diluted earnings (loss) per share $ (0.37) $ 0.21 $ (0.22) $ 0.83