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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Computation of diluted earnings per common share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Numerator:                      
Net income $ (5,321) $ 647 $ (187) $ 1,515 $ 947 $ 2,102 $ 1,981 $ 2,418 $ (3,346) $ 7,448 $ 7,072
Denominator:                      
Weighted average common shares outstanding (basic) (in shares)                 17,143 17,107 17,073
Effect of stock options (in shares)                 1 39 41
Weighted average common shares outstanding (diluted) (in shares)                 17,144 17,146 17,114
Earnings per common share:                      
Basic (in dollars per share) $ (0.31) $ 0.04 $ (0.01) $ 0.09 $ 0.06 $ 0.12 $ 0.12 $ 0.14 $ (0.20) $ 0.44 $ 0.41
Diluted (in dollars per share) $ (0.31) $ 0.04 $ (0.01) $ 0.09 $ 0.06 $ 0.12 $ 0.12 $ 0.14 $ (0.20) $ 0.43 $ 0.41