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Consolidated Statements of Earnings [Parenthetical] | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Percentage Of Stocks Dividend | 5.00% | 5.00% | 5.00%

X
- 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