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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
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