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Significant Accounting Policies - Computations of Diluted Earnings (Loss) Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
EPS numerator:    
Net income (loss) $ 5,807 $ (1,775)
EPS denominator:    
Weighted average shares outstanding – basic (in shares) 7,865,089 7,662,362
Weighted average shares outstanding – diluted (in shares) 8,065,464 7,662,362
Net income (loss):    
Basic (in usd per share) $ 0.74 $ (0.23)
Diluted (in usd per share) $ 0.72 $ (0.23)
Nonvested restricted stock units    
EPS denominator:    
Incremental shares attributable to share-based payments (in shares) 191,000 0
Employee stock purchase plan    
EPS denominator:    
Incremental shares attributable to share-based payments (in shares) 9,000 0