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Note 14 - Financial Instruments and Fair Value Measurements (Details) (USD $)	0 Months Ended
	Jan. 25, 2015	Mar. 26, 2015	Mar. 29, 2015	Dec. 28, 2014	Sep. 28, 2014
Note 14 - Financial Instruments and Fair Value Measurements (Details) [Line Items]
Property, Plant and Equipment, Net			$ 28,292,000us-gaap_PropertyPlantAndEquipmentNet	$ 32,739,000us-gaap_PropertyPlantAndEquipmentNet
Rock Ohio Ventures [Member]
Note 14 - Financial Instruments and Fair Value Measurements (Details) [Line Items]
Cost Method Investments, Fair Value Disclosure				800,000us-gaap_CostMethodInvestmentsFairValueDisclosure / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = laco_RockOhioVenturesMember	0us-gaap_CostMethodInvestmentsFairValueDisclosure / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = laco_RockOhioVenturesMember
Payments for (Proceeds from) Investments	(800,000)us-gaap_PaymentsForProceedsFromInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = laco_RockOhioVenturesMember
Office Facility Located in Minnetonka, Minnesota [Member]
Note 14 - Financial Instruments and Fair Value Measurements (Details) [Line Items]
Disposal Group, Including Discontinued Operation, Consideration		4,700,000us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = laco_OfficeFacilityLocatedInMinnetonkaMinnesotaMember
Purchase and Sale Agreement, Fees and Closing Costs		300,000laco_PurchaseAndSaleAgreementFeesAndClosingCosts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = laco_OfficeFacilityLocatedInMinnetonkaMinnesotaMember
Property, Plant and Equipment, Net			$ 4,400,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = laco_OfficeFacilityLocatedInMinnetonkaMinnesotaMember

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Represents fees and closing costs incurred under purchase and sale agreement.

+ References

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Fair value portion of investments accounted under the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 325

-SubTopic 20

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=29638263&loc=d3e39828-111592

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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3095-108585



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-Paragraph 9

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5



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-Name Regulation S-X (SX)

-Number 210

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