Note 12 - Operating Leases - Operating Leases (Details)	Dec. 31, 2021 USD ($)
2022	$ 406,000
2023	302,000
2024	58,000
Lessee, Operating Lease, Liability, Payments, Net Of Sublease Income, Due	$ 766,000

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year, net of sublease income.

No definition available.

Name:	ams_LesseeOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree
Namespace Prefix:	ams_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant