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Note 9 - Other Long-term Liabilities (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Amortization of Deferred Revenue	$ 2,357	$ 2,025

X

- Definition

The amortization amount of deferred revenue.

+ References

No definition available.

+ Details

Name:	alsk_AmortizationOfDeferredRevenue
Namespace Prefix:	alsk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration