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NATURE OF OPERATIONS - IPO and Corporate Conversion (Details)
$ / shares in Units, د.ت in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Apr. 17, 2019
$ / shares
shares
Jan. 01, 2018
shares
Jan. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2020
TND (د.ت)
$ / shares
shares
Nature of operations          
Shares issued upon incorporation (in shares)   20,000,000      
Shares repurchased 300,000       145,065
Share repurchase price (in dollars per share) | $ / shares $ 10.20       $ 9.77
Value of shares authorized for repurchase | د.ت         $ 10,000
IPO          
Nature of operations          
Shares issued from sale of common stock     600,000 4,000,000  
Share price (in dollars per share) | $ / shares     $ 12.00 $ 12.00  
Offering costs | $     $ 505 $ 4,504  
Proceeds from IPO net of underwriting discounts and offering expenses | $     $ 6,695 $ 43,492