Note 7 - Intangible Assets, Net (Details) - USD ($)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Transfer 3% equity of Shandong Spring Pharmaceutical To a Noncontrolling Shareholder		$ (2,002,509)
Amortization of intangible assets	$ (1,282,495)	(1,098,757)
Yuanbaofen product
Transfer 3% equity of Shandong Spring Pharmaceutical To a Noncontrolling Shareholder	$ 448,690
Finite-Lived Intangible Asset, Useful Life	10 years
Amortization of intangible assets	$ 166,606	0
Yuanbaofen product | Minimum
Finite-Lived Intangible Asset, Useful Life	3 years
Yuanbaofen product | Maximum
Finite-Lived Intangible Asset, Useful Life	10 years
Use Rights
Finite-Lived Intangible Asset, Useful Life	50 years
Amortization of intangible assets	$ 30,634	30,163
Patents
Amortization of intangible assets	$ 1,085,255	$ 1,068,594