Note 10 - Junior Subordinated Debentures (Details Textual)	Dec. 31, 2019
Number of Consecutive Quarterly Periods to Defer Interest Payments Without Default or Penalty	20
London Interbank Offered Rate (LIBOR) [Member]
Effective Interest Rate of Index Subordinated Borrowing Is Tied To	1.91%

Effective rate of the base index the variable interest rate on subordinated borrowing is tied to as of the reporting date.

No definition available.

Name:	lmst_EffectiveInterestRateOfIndexSubordinatedBorrowingIsTiedTo
Namespace Prefix:	lmst_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant