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Consolidated Statements of Earnings (Unaudited) (Parenthetical) | 12 Months Ended
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Dec. 31, 2020
Consolidated Statements Of Earnings Unaudited |
Percentage of stocks dividend | 5.00%

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- Definition The percentage rate used to calculate stock dividend payments. + References No definition available. + Details
Name: | LARK_PercentageOfStocksDividend
Namespace Prefix: | LARK_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | LARK_StatementConsolidatedStatementsOfEarningsUnauditedParentheticalAbstract
Namespace Prefix: | LARK_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration