Note 17 - Stock Plans and Stock Based Compensation - Unrecognized Stock Based Compensation Expense Related to Unvested Shares (Details) $ in Thousands	Dec. 31, 2018 USD ($)
2019	$ 287
2020	213
2021	94
2022 & thereafter

The expected future compensation expense related to unvested shares in year four and thereafter.

No definition available.

Name:	lmst_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpectedFutureCompensationYearFourAndThereafter
Namespace Prefix:	lmst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant