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Net Income (Loss) per Common Share (Tables)	12 Months Ended
Net Income (Loss) per Common Share (Tables)	Dec. 31, 2020
Net Income (Loss) per Common Share
Computation of basic and diluted net income (loss) per common share	December 31, 2020 2019 2018 Net income (loss) $ 8,165,000 $ (15,223,000) $ (4,782,000) Less: net income allocated to participating securities 424,000 — — Net income (loss) available to common shareholders $ 7,741,000 $ (15,223,000) $ (4,782,000) Weighted average common shares outstanding — basic 7,936,000 7,830,000 7,750,000 Effect of dilutive securities 3,000 — — Weighted average common and potentially issuable common shares outstanding — diluted 7,939,000 7,830,000 7,750,000 Basic net income (loss) per common share $ 0.98 $ (1.94) $ (0.62) Diluted net income (loss) per common share $ 0.98 $ (1.94) $ (0.62) December 31, 2020 2019 2018 Net income allocated to participating securities $ 424,000 — — Weighted average participating shares outstanding — basic 434,000 300,000 216,000 Effect of dilutive securities — — — Weighted average participating and potentially issuable participating shares outstanding — diluted 434,000 300,000 216,000 Basic net income per participating share $ 0.98 $ — $ — Diluted net income per participating share $ 0.98 $ — $ —