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Note 14 - Business Segment Reporting (Detail) - Operations by Business Segment (USD $)
 3 Months Ended 9 Months Ended
Feb. 24, 2013
Feb. 26, 2012
Feb. 24, 2013
Feb. 26, 2012
Gross profit $ 17,508,000 $ 13,172,000 $ 49,730,000 $ 37,432,000
Net income (loss) 4,789,000 4,765,000 18,068,000 9,917,000
Dividend Income 281,000 281,000 844,000 844,000
Interest income 46,000 63,000 104,000 219,000
Interest expense 487,000 153,000 1,526,000 492,000
Income tax expense 2,754,000 2,920,000 8,238,000 6,079,000
Food Products Technology [Member]
        
Net sales 86,707,000 56,456,000 233,931,000 146,512,000
International sales 7,293,000 5,179,000 19,475,000 14,890,000
Gross profit 5,846,000 5,478,000 28,891,000 16,068,000
Net income (loss) 338,000 5,851,000 15,466,000 11,846,000
Depreciation and amortization 1,224,000 762,000 3,634,000 2,313,000
Dividend Income 281,000 281,000 844,000 844,000
Interest income 4,000 12,000 12,000 42,000
Interest expense 421,000   1,303,000  
Income tax expense 113,000   3,846,000  
Food Export [Member]
        
Net sales 13,381,000 12,388,000 66,854,000 57,972,000
International sales 13,381,000 12,159,000 66,747,000 57,619,000
Gross profit 1,031,000 917,000 4,407,000 3,733,000
Net income (loss) 228,000 339,000 1,403,000 1,729,000
Depreciation and amortization 1,000 2,000 3,000 6,000
Income tax expense 76,000   467,000  
HA-based Biomaterials [Member]
        
Net sales 17,331,000 11,066,000 33,043,000 27,422,000
International sales 13,579,000 7,600,000 22,603,000 19,250,000
Gross profit 10,243,000 6,623,000 15,725,000 14,602,000
Net income (loss) 5,687,000 3,970,000 5,713,000 7,270,000
Depreciation and amortization 602,000 572,000 1,777,000 1,655,000
Interest income 42,000 43,000 92,000 148,000
Interest expense 66,000 153,000 223,000 492,000
Income tax expense 1,895,000   1,904,000  
Corporate [Member]
        
Net sales 448,000 154,000 767,000 3,029,000
Gross profit 388,000 154,000 707,000 3,029,000
Net income (loss) (1,464,000) (5,395,000) (4,514,000) (10,928,000)
Depreciation and amortization 39,000 46,000 113,000 137,000
Interest income   8,000   29,000
Income tax expense 670,000 2,920,000 2,021,000 6,079,000
Total [Member]
        
Net sales 117,867,000 80,064,000 334,595,000 234,935,000
International sales 34,253,000 24,938,000 108,825,000 91,759,000
Gross profit 17,508,000 13,172,000 49,730,000 37,432,000
Net income (loss) 4,789,000 4,765,000 18,068,000 9,917,000
Depreciation and amortization 1,866,000 1,382,000 5,527,000 4,111,000
Dividend Income 281,000 281,000 844,000 844,000
Interest income 46,000 63,000 104,000 219,000
Interest expense 487,000 153,000 1,526,000 492,000
Income tax expense $ 2,754,000 $ 2,920,000 $ 8,238,000 $ 6,079,000