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Earnings Per Share - Basic (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020 | Mar. 31, 2019
Net Income (Loss) Attributable to Parent [Abstract] |  |  |  |  |  |
Net income attributable to common shareholders | $ 1,537 | $ 5,461 | $ 4,212 | $ 5,154 | $ 6,998 | $ 9,366
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |
Weighted average number of basic common shares outstanding (in shares) | 51,489,211 |  | 51,414,619 |  | 51,489,211 | 51,414,619
Net income per common share attributable to common shareholders, basic (in dollars per share) | $ 0.03 |  | $ 0.08 |  | $ 0.14 | $ 0.18

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