Note 9 - Major Customer and Vendor (Details)	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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 five distributors represented 17%, 14%, 12%, 11%, and 11% of total sales	Sales to four distributors represented 19%, 16%, 15% and 13% of total sales	sales through six distributors represented 16%, 14%, 12%, 12%, 11% and 10% of total sales	Sales to four distributors represented 17%, 17%, 13% and 13% of total sales
Concentration Risk, Product	Sales of three products represented 38%, 25%, and 14% of total sales	Sales of three products represented 50%, 10%, and 10% of total sales	Sales of three products represented 37%, 25%, and 12% of total sales	Sales of four products represented 43%, 14%, 10% and 10% of total sales
Shandong Yongchuntang
Concentration Risk, Supplier	43%	43%	40%	49%
Other Vendor 1
Concentration Risk, Supplier	20%	20%	26%	20%
Other Vendor 2
Concentration Risk, Supplier	13%	17%	11%	16%
Other Vendor 3
Concentration Risk, Supplier	12%	10%	11%