Note 13 - Major Customer and Vendor (Details)	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Concentration Risk, Other Risk	Sales to four distributors represented 18%, 13%, 12% and 11% of total sales
Concentration Risk, Product	Sales of three products represented 44%, 19% and 14% of total sales
Shandong Yongchuntang
Concentration Risk, Supplier	42%	36%
Other Vendor 1
Concentration Risk, Supplier	25%
Other Vendor 2
Concentration Risk, Supplier	16%
Other Vendor 3
Concentration Risk, Supplier		24%
Other Vendor 4
Concentration Risk, Supplier		15%
Other Vendor 5
Concentration Risk, Supplier		12%

Description of risks that arise due to the volume of business transacted with a particular supplier or reliance placed on that supplier. At a minimum, the description informs financial statement users of the general nature of the risk.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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