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v3.21.1

Consolidated Statements of Earnings (Parenthetical) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Consolidated Statements Of Earnings |  |  |
Percentage Of stocks dividend | 5.00% | 5.00% | 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: | num:percentItemType
Balance Type: | na
Period Type: | duration

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