Note 13 - Segment Information (Details Textual)	12 Months Ended
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%

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.

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

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Data Type:	num:percentItemType
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