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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Computation of diluted earnings per common share (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
$ / shares
Jun. 30, 2022
USD ($)
$ / shares
Mar. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Sep. 30, 2021
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
location
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES                      
Number of locations in Pennsylvania | location                 16    
Number of locations in state Maryland | location                 1    
Numerator:                      
Net income | $ $ 947 $ 2,102 $ 1,981 $ 2,418 $ 1,852 $ 1,431 $ 1,708 $ 2,081 $ 7,448 $ 7,072 $ 4,598
Denominator:                      
Weighted average common shares outstanding (basic)                 17,107 17,073 17,053
Effect of stock options                 39 41 10
Weighted average common shares outstanding (diluted)                 17,146 17,114 17,063
Earnings per common share:                      
Basic | $ / shares $ 0.06 $ 0.12 $ 0.12 $ 0.14 $ 0.11 $ 0.08 $ 0.10 $ 0.12 $ 0.44 $ 0.41 $ 0.27
Diluted | $ / shares $ 0.06 $ 0.12 $ 0.12 $ 0.14 $ 0.11 $ 0.08 $ 0.10 $ 0.12 $ 0.43 $ 0.41 $ 0.27