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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Computation of basic and diluted earnings per share (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Numerator:
Net loss	$ (7,583)	$ (20,809)	$ (708)
Net (Income) Loss attributable to noncontrolling interests	1,938	(1,299)	(13,414)
Net Loss attributable to ATN International, Inc. stockholders- Basic	(5,645)	(22,108)	(14,122)
Less: Preferred dividends	(4,856)	(1,962)
Net Loss attributable to ATN International, Inc. common stockholders- Diluted	$ (10,501)	$ (24,070)	$ (14,122)
Denominator:
Weighted-average shares outstanding- Basic	15,751	15,867	15,923
Weighted-average shares outstanding- Diluted	15,751	15,867	15,923

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