EARNINGS PER SHARE AND REDEEMABLE NONCONTROLLING INTERESTS - Computation (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator:
Net income (loss) attributable to ATN International, Inc. stockholders- Basic	$ 767	$ (525)	$ (5,118)	$ (1,471)
Less: Preferred dividends	(1,260)	(1,154)	(2,306)	(2,270)
Net Loss attributable to ATN International, Inc. common stockholders- Diluted	$ (493)	$ (1,679)	$ (7,424)	$ (3,741)
Denominator:
Weighted-average shares outstanding- Basic	15,719	15,749	15,726	15,736
Weighted-average shares outstanding- Diluted	15,719	15,749	15,726	15,736