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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, 2021
USD ($)
$ / shares
Sep. 30, 2021
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
location
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
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 | $ $ 1,852 $ 1,431 $ 1,708 $ 2,081 $ 692 $ 1,078 $ 1,419 $ 1,409 $ 7,072 $ 4,598 $ 6,028
Denominator:                      
Weighted average common shares outstanding (basic)                 17,073 17,053 17,359
Effect of stock options                 41 10 81
Weighted average common shares outstanding (diluted)                 17,114 17,063 17,440
Earnings per common share:                      
Basic | $ / shares $ 0.11 $ 0.08 $ 0.10 $ 0.12 $ 0.04 $ 0.06 $ 0.08 $ 0.08 $ 0.41 $ 0.27 $ 0.35
Diluted | $ / shares $ 0.11 $ 0.08 $ 0.10 $ 0.12 $ 0.04 $ 0.06 $ 0.08 $ 0.08 $ 0.41 $ 0.27 $ 0.35