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Investments (Details Narrative) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Security owned and pledged as collateral, fair value	$ 355.7	$ 331.7
Investment [Member]
Equity method investment, ownership percentage	10.00%

X

- Definition

Security owned and pledged as collateral fair values.

+ References

No definition available.

+ Details

Name:	LARK_SecurityOwnedAndPledgedAsCollateralFairValues
Namespace Prefix:	LARK_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=LARK_InvestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: