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Note 13 - Segment Information (Details Textual) | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Number of Reportable Segments | 3 |  |
Fruit and Vegetable Segment [Member] |  |  |
Assets Percentage | 95.00% | 99.00% | 99.00%
Income (Loss) Fom Continuing Operations Before Income Taxes Percentage | 112.00% | 97.00% | 100.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | Non-US [Member] |  |  |
Concentration Risk, Percentage | 6.90% | 7.60% | 8.50%
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Green Giant Vegetables [Member] |  |  |
Concentration Risk, Percentage | 9.00% | 11.00% | 12.00%

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X
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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