Note 11 - Commitment and Contingencies 2 (Details Textual) $ in Millions	Mar. 31, 2026 USD ($)
Location, Statement of Financial Position, Balance [Axis]: ater:AccruedExpensesAndOtherLiabilitiesCurrent
Loss Contingency, Accrual, Current	$ 0.4

Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Name:	us-gaap_LossContingencyAccrualCarryingValueCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant