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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, 2024	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net loss attributable to ATN International, Inc. stockholders- Basic	$ (26,429)	$ (14,538)	$ (5,645)
Less: Preferred dividends	(5,610)	(4,942)	(4,856)
Net loss attributable to ATN International, Inc. common stockholders- Diluted	$ (32,039)	$ (19,480)	$ (10,501)
Denominator:
Weighted-average shares outstanding- Basic	15,229	15,595	15,751
Weighted-average shares outstanding- Diluted	15,229	15,595	15,751

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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