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Schedule of Shares Used in Calculation of Basic and Diluted Earnings Per Share (Details) (Parenthetical)	3 Months Ended
	Mar. 31, 2024
Earnings per share:
Percentage of stock dividend	5.00%

X

- Definition

Stock dividend, percentage.

+ References

No definition available.

+ Details

Name:	LARK_PercentageOfStockDividend
Namespace Prefix:	LARK_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_EarningsPerShareAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration