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Summary of Significant Accounting Policies - Basic and diluted earnings per share (Details 1) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net (loss) income per consolidated statements of income | $ 644 | $ (2,898) | $ 344 | $ 812 | $ (1,070) | $ 1,606 | $ 1,970 | $ 2,903 | $ (1,098) | $ 5,409 | $ 12,379
Less: Allocation of earnings to participating securities |  |  |  |  |  |  |  |  | 14 | (70) | (170)
Net (loss) income allocated to common stock |  |  |  |  |  |  |  |  | (1,084) | 5,339 | 12,209
Basic earnings (loss) per share computation: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) allocated to common stock |  |  |  |  |  |  |  |  | $ (1,084) | $ 5,339 | $ 12,209
Weighted average common shares outstanding, including shares considered participating securities |  |  |  |  |  |  |  |  | 7,819 | 7,766 | 7,727
Less: Weighted average participating securities outstanding |  |  |  |  |  |  |  |  | (100) | (102) | (105)
Weighted average shares of common stock |  |  |  |  |  |  |  |  | 7,719 | 7,664 | 7,622
Basic earnings (loss) per share | $ 0.08 | $ (0.37) | $ 0.04 | $ 0.10 | $ (0.14) | $ 0.21 | $ 0.25 | $ 0.37 | $ (0.14) | $ 0.70 | $ 1.60
Diluted earnings (loss) per share computation: |  |  |  |  |  |  |  |  |  |  |
Net (loss) income allocated to common stock |  |  |  |  |  |  |  |  | $ (1,084) | $ 5,339 | $ 12,209
Undistributed earnings re-allocated to participating securities |  |  |  |  |  |  |  |  | 0 | 0 | 2
Numerator for diluted earnings (loss) per share |  |  |  |  |  |  |  |  | $ (1,084) | $ 5,339 | $ 12,211
Weighted average common shares outstanding for basic earnings (loss) per share |  |  |  |  |  |  |  |  | 7,719 | 7,664 | 7,622
Incremental shares from stock options |  |  |  |  |  |  |  |  | 0 | 62 | 70
Weighted average shares and dilutive potential common shares |  |  |  |  |  |  |  |  | 7,719 | 7,726 | 7,692
Diluted earnings (loss) per share | $ 0.08 | $ (0.37) | $ 0.04 | $ 0.10 | $ (0.14) | $ 0.21 | $ 0.25 | $ 0.37 | $ (0.14) | $ 0.69 | $ 1.59

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