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Note 14 - Business Segment Reporting (Details) - Operations by Business Segment (USD $)
 3 Months Ended 9 Months Ended
Feb. 23, 2014
Feb. 24, 2013
Feb. 23, 2014
Feb. 23, 2014
Feb. 24, 2013
Segment Reporting Information [Line Items]          
Net sales $ 126,379,000 $ 117,867,000 $ 355,884,000   $ 334,595,000
International sales 33,302,000 34,253,000 105,197,000   108,825,000
Gross profit 20,155,000 17,508,000 46,421,000   49,730,000
Net income (loss) 6,400,000 4,789,000 14,603,000   18,068,000
Depreciation and amortization 1,577,000 1,866,000 5,364,000   5,527,000
Dividend Income 281,000 281,000 844,000 844,000 844,000
Interest income 78,000 46,000 183,000   104,000
Interest expense 390,000 487,000 1,257,000   1,526,000
Income tax expense 3,679,000 2,754,000 8,028,000   8,238,000
Food Products Technology [Member]
          
Segment Reporting Information [Line Items]          
Net sales 95,431,000 86,707,000 262,957,000   233,931,000
International sales 12,013,000 7,293,000 31,836,000   19,475,000
Gross profit 7,282,000 5,846,000 24,383,000   28,891,000
Net income (loss) 131,000 338,000 9,402,000   15,466,000
Depreciation and amortization 1,040,000 1,224,000 3,566,000   3,634,000
Dividend Income 281,000 281,000 844,000   844,000
Interest income 3,000 4,000 8,000   12,000
Interest expense 332,000 421,000 1,064,000   1,303,000
Income tax expense 468,000 113,000 2,434,000   3,846,000
Food Export [Member]
          
Segment Reporting Information [Line Items]          
Net sales 10,676,000 13,381,000 55,106,000   66,854,000
International sales 10,676,000 13,381,000 55,005,000   66,747,000
Gross profit 990,000 1,031,000 4,015,000   4,407,000
Net income (loss) 206,000 228,000 1,209,000   1,403,000
Depreciation and amortization 1,000 1,000 3,000   3,000
Income tax expense 58,000 76,000 341,000   467,000
HA-based Biomaterials [Member]
          
Segment Reporting Information [Line Items]          
Net sales 20,176,000 17,331,000 37,539,000   33,043,000
International sales 10,613,000 13,579,000 18,356,000   22,603,000
Gross profit 11,787,000 10,243,000 17,800,000   15,725,000
Net income (loss) 7,192,000 5,687,000 7,427,000   5,713,000
Depreciation and amortization 504,000 602,000 1,692,000   1,777,000
Interest income 74,000 42,000 174,000   92,000
Interest expense 58,000 66,000 193,000   223,000
Income tax expense 2,028,000 1,895,000 2,094,000   1,904,000
Corporate Segment [Member]
          
Segment Reporting Information [Line Items]          
Net sales 96,000 448,000 282,000   767,000
Gross profit 96,000 388,000 223,000   707,000
Net income (loss) (1,129,000) (1,464,000) (3,435,000)   (4,514,000)
Depreciation and amortization 32,000 39,000 103,000   113,000
Interest income 1,000   1,000    
Income tax expense $ 1,125,000 $ 670,000 $ 3,159,000   $ 2,021,000