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Note 11 - Business Segment Reporting - Operations by Business Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
May. 31, 2015
May. 25, 2014
May. 26, 2013
Food Products Technology [Member]      
Net sales $ 430,415 $ 360,728 $ 320,447
International sales 80,500 47,224 27,532
Gross profit 45,993 36,318 37,077
Net income applicable to Common Stockholders 17,145 19,041 20,526
Identifiable assets 228,672 196,257 180,104
Depreciation and amortization 4,766 4,751 4,761
Capital expenditures 12,895 10,950 5,598
Dividend income 1,417 1,125 1,125
Interest income 32 12 42
Interest expense 1,655 1,402 1,707
Income tax expense 792 33 3,399
Food Export [Member]      
Net sales 67,837 69,827 78,568
International sales 67,714 69,710 78,442
Gross profit 4,252 5,340 5,274
Net income applicable to Common Stockholders 1,041 1,973 1,660
Identifiable assets 27,746 25,391 21,737
Depreciation and amortization $ 6 $ 6 $ 4
Capital expenditures      
Dividend income      
Interest income      
Interest expense      
Income tax expense $ 48 $ 3 $ 339
HA Based Biomaterials [Member]      
Net sales 40,432 45,704 41,281
International sales 15,246 20,312 26,792
Gross profit 14,609 20,456 19,102
Net income applicable to Common Stockholders 3,838 9,695 6,835
Identifiable assets 85,779 85,858 80,940
Depreciation and amortization 2,184 2,221 2,379
Capital expenditures $ 4,499 $ 3,877 $ 3,190
Dividend income      
Interest income $ 254 $ 242 $ 137
Interest expense 174 248 301
Income tax expense 177 17 1,400
Corporate Segment [Member]      
Net sales $ 573 $ 554 $ 1,412
International sales      
Gross profit $ 553 $ 450 $ 1,307
Net income applicable to Common Stockholders (8,480) (11,564) (6,434)
Identifiable assets 4,268 6,117 8,161
Depreciation and amortization 134 136 151
Capital expenditures $ 117 $ 59 $ 89
Dividend income      
Interest income $ 29 $ 6  
Interest expense      
Income tax expense $ 6,729 $ 10,530 $ 4,314
Net sales 539,257 476,813 441,708
International sales 163,460 137,246 132,766
Gross profit 65,407 62,564 62,760
Net income applicable to Common Stockholders 13,544 19,145 22,587
Identifiable assets 346,465 313,623 290,942
Depreciation and amortization 7,090 7,114 7,295
Capital expenditures 17,511 14,886 8,877
Dividend income 1,417 1,125 1,125
Interest income 315 260 179
Interest expense 1,829 1,650 2,008
Income tax expense $ 7,746 $ 10,583 $ 9,452