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Note 9 - Business Segment Reporting - Operations by Business Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended
Nov. 25, 2018
Nov. 26, 2017
Nov. 25, 2018
Nov. 26, 2017
Net sales $ 124,912,000 $ 122,461,000 $ 249,580,000 $ 238,242,000
Gross profit 16,593,000 14,921,000 32,930,000 33,723,000
Net (loss) income from continuing operations (584,000) 414,000 (395,000) 2,769,000
Depreciation and amortization 3,313,000 2,980,000 6,458,000 5,934,000
Dividend income 412,000 412,000 825,000 825,000
Interest income 33,000 42,000 79,000 73,000
Interest expense, net (1) 746,000 [1] 480,000 1,504,000 884,000
Income tax (benefit) expense 277,000 165,000 342,000 1,475,000
International [Member]        
Net sales 23,209,000 20,424,000 47,038,000 42,097,000
Natural Foods [Member]        
Net sales 109,466,000 108,348,000 221,517,000 211,965,000
Gross profit 10,915,000 9,704,000 24,285,000 24,984,000
Net (loss) income from continuing operations (418,000) (435,000) 1,349,000 3,166,000
Depreciation and amortization 2,196,000 1,958,000 4,236,000 3,930,000
Dividend income 412,000 412,000 825,000 825,000
Interest income 30,000 18,000 61,000 28,000
Interest expense, net (1) 276,000 [1] 863,000
Income tax (benefit) expense (50,000) (95,000) 612,000 1,002,000
Natural Foods [Member] | International [Member]        
Net sales 20,367,000 17,749,000 40,480,000 35,923,000
Biomaterials [Member]        
Net sales 15,446,000 14,113,000 28,063,000 26,277,000
Gross profit 5,678,000 5,217,000 8,645,000 8,739,000
Net (loss) income from continuing operations 1,298,000 1,260,000 751,000 1,105,000
Depreciation and amortization 978,000 910,000 1,954,000 1,775,000
Dividend income
Interest income
Interest expense, net (1) [1]
Income tax (benefit) expense 432,000 374,000 250,000 347,000
Biomaterials [Member] | International [Member]        
Net sales 2,842,000 2,675,000 6,558,000 6,174,000
Other Segments [Member]        
Net sales
Gross profit
Net (loss) income from continuing operations (1,464,000) (411,000) (2,495,000) (1,502,000)
Depreciation and amortization 139,000 112,000 268,000 229,000
Dividend income
Interest income 3,000 24,000 18,000 45,000
Interest expense, net (1) 470,000 [1] 480,000 641,000 884,000
Income tax (benefit) expense (105,000) (114,000) (520,000) 126,000
Other Segments [Member] | International [Member]        
Net sales
[1] Beginning in first quarter of fiscal 2019, the Company began allocating interest expense to its reportable segments in information provided to its CODM to enhance visibility into how financing activities impact the discrete financial results.