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Note 11 - Business Segment Reporting - Operations by Business Segment (Details) (USD $) | 3 Months Ended | 6 Months Ended
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Nov. 30, 2014 | Nov. 24, 2013 | Nov. 30, 2014 | Nov. 24, 2013
Net sales | $ 132,665,000 us-gaap_SalesRevenueNet | $ 120,026,000 us-gaap_SalesRevenueNet | $ 266,279,000 us-gaap_SalesRevenueNet | $ 229,505,000 us-gaap_SalesRevenueNet
International sales | 41,600,000 us-gaap_OtherSalesRevenueNet | 36,651,000 us-gaap_OtherSalesRevenueNet | 87,972,000 us-gaap_OtherSalesRevenueNet | 71,895,000 us-gaap_OtherSalesRevenueNet
Gross profit | 15,666,000 us-gaap_GrossProfit | 13,734,000 us-gaap_GrossProfit | 29,854,000 us-gaap_GrossProfit | 26,266,000 us-gaap_GrossProfit
Net income (loss) | 3,223,000 us-gaap_NetIncomeLoss | 3,451,000 us-gaap_NetIncomeLoss | 5,576,000 us-gaap_NetIncomeLoss | 8,203,000 us-gaap_NetIncomeLoss
Depreciation and amortization | 1,830,000 us-gaap_DepreciationDepletionAndAmortization | 1,945,000 us-gaap_DepreciationDepletionAndAmortization | 3,343,000 us-gaap_DepreciationDepletionAndAmortization | 3,787,000 us-gaap_DepreciationDepletionAndAmortization
Investment Income, Dividend | 321,000 us-gaap_InvestmentIncomeDividend | 281,000 us-gaap_InvestmentIncomeDividend | 602,000 us-gaap_InvestmentIncomeDividend | 563,000 us-gaap_InvestmentIncomeDividend
Interest income | 91,000 us-gaap_InvestmentIncomeInterest | 46,000 us-gaap_InvestmentIncomeInterest | 184,000 us-gaap_InvestmentIncomeInterest | 105,000 us-gaap_InvestmentIncomeInterest
Interest expense | 472,000 us-gaap_InterestExpense | 436,000 us-gaap_InterestExpense | 855,000 us-gaap_InterestExpense | 867,000 us-gaap_InterestExpense
Income tax expense | 1,785,000 us-gaap_IncomeTaxExpenseBenefit | 1,874,000 us-gaap_IncomeTaxExpenseBenefit | 3,086,000 us-gaap_IncomeTaxExpenseBenefit | 4,349,000 us-gaap_IncomeTaxExpenseBenefit
Corporate Segment [Member] |  |  |  |
Net sales | 162,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 128,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 262,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 186,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Gross profit | 161,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 69,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 261,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 127,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Net income (loss) | (991,000)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 108,000 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (1,013,000)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (2,306,000)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Depreciation and amortization | 31,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 36,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 62,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 71,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Interest income | 9,000 us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | 20,000 us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
Income tax expense | 1,252,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 36,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 1,890,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 2,034,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Food Export [Member] |  |  |  |
Net sales | 22,106,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 23,031,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 48,703,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 44,430,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember
International sales | 22,106,000 us-gaap_OtherSalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 22,940,000 us-gaap_OtherSalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 48,693,000 us-gaap_OtherSalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 44,329,000 us-gaap_OtherSalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember
Gross profit | 1,550,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 1,820,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 2,736,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 3,025,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember
Net income (loss) | 582,000 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 727,000 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 853,000 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 1,003,000 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember
Depreciation and amortization | 1,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 1,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 2,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 2,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember
Income tax expense | 95,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 205,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 139,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember | 283,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodExportMember
Food Products Technology [Member] |  |  |  |
Net sales | 102,079,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 88,090,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 202,185,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 167,526,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember
International sales | 17,760,000 us-gaap_OtherSalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 10,345,000 us-gaap_OtherSalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 35,911,000 us-gaap_OtherSalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 19,823,000 us-gaap_OtherSalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember
Gross profit | 11,151,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 8,220,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 23,005,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 17,101,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember
Net income (loss) | 3,644,000 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 2,005,000 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 7,290,000 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 9,271,000 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember
Depreciation and amortization | 1,237,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 1,304,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 2,247,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 2,526,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember
Investment Income, Dividend | 321,000 us-gaap_InvestmentIncomeDividend / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 281,000 us-gaap_InvestmentIncomeDividend / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 602,000 us-gaap_InvestmentIncomeDividend / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 563,000 us-gaap_InvestmentIncomeDividend / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember
Interest income | 15,000 us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 2,000 us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 26,000 us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 5,000 us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember
Interest expense | 425,000 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 356,000 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 763,000 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 732,000 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember
Income tax expense | 440,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 1,461,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 1,310,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember | 1,966,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = lndc_FoodProductsTechnologyMember
HA Based Biomaterials [Member] |  |  |  |
Net sales | 8,318,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 8,777,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 15,129,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 17,363,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember
International sales | 1,734,000 us-gaap_OtherSalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 3,366,000 us-gaap_OtherSalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 3,368,000 us-gaap_OtherSalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 7,743,000 us-gaap_OtherSalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember
Gross profit | 2,804,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 3,625,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 3,852,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 6,013,000 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember
Net income (loss) | (12,000)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 611,000 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | (1,554,000)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 235,000 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember
Depreciation and amortization | 561,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 604,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 1,032,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 1,188,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember
Interest income | 67,000 us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 44,000 us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 138,000 us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 100,000 us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember
Interest expense | 47,000 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 80,000 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 92,000 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | 135,000 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember
Income tax expense | $ (2,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | $ 172,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | $ (253,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember | $ 66,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = lndc_HAbasedBiomaterialsMember

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