Note 9 - Major Customer and Vendor (Details)	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Number Of Major Distributors	The Company sold products through ten distributors	The Company sold products through ten distributors
Concentration Risk, Other Risk	Sales to six distributors represented 15%, 14%, 12%, 12%, 10%, and 10% of total sales	Sales to four distributors represented 19%, 16%, 11% and 11% of total sales
Concentration Risk, Product	Sales of three products represented 37%, 25%, and 11% of total sales	Sales of four products represented 37%, 17%, 11%, and 11% of total sales
Shandong Yongchuntang
Concentration Risk, Supplier	37%	54%
Other Vendor 1
Concentration Risk, Supplier	31%, 10%
Other Vendor 2
Concentration Risk, Supplier	10%
Other Vendor 3
Concentration Risk, Supplier		19%
Other Vendor 4
Concentration Risk, Supplier		14%