EARNINGS PER SHARE AND REDEEMABLE NONCONTROLLING INTERESTS - Computation of basic and diluted earnings per share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net Income (loss) attributable to ATN International, Inc. Stockholders	$ (2,783)	$ (2,619)	$ (4,255)	$ 2,103
Less: Preferred dividends	1,192	846	3,462	846
Net income (loss) attributable to ATN International, Inc. common stockholders	$ (3,975)	$ (3,465)	$ (7,717)	$ 1,257
Denominator:
Weighted-average shares outstanding- Basic	15,763	15,860	15,746	15,891
Stock options, restricted stock units and performance stock units				10
Weighted-average shares outstanding- Diluted	15,763	15,860	15,746	15,901