Note 5 - Major Customer and Vendor (Details)	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Number Of Major Distributors	The Company sold products through ten distributors	The Company sold products through ten distributors	The Company sold products through ten distributors	The Company sold products through ten distributors
Concentration Risk, Other Risk	Sales to three distributors represented 26%, 19%, and 8% of total sales	sales to two distributors represented 37% and 29% of total sales	sales through three distributors represented 28%, 22%, and 10% of total sales	sales through three distributors represented 37%, 16%, and 15% of total sales
Concentration Risk, Product	Sales of two products represented 53% and 22% of total sales	Sales of one product represented 69% of total sales	Sales of two products represented 60% and 12% of total sales	Sales of one product represented 69% of total sales
Shandong YCT
Concentration Risk, Supplier	39%	29%	33%	34%
Other Vendor 1
Concentration Risk, Supplier	23%	44%	30%	32%
Other Vendor 2
Concentration Risk, Supplier	20%	26%	21%	23%
Other Vendor 3
Concentration Risk, Supplier	10%