Note 5 - Major Customer and Vendor (Details)	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 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 two distributors represented 23% and 19% of total sales	sales to three distributors represented 40%, 22%, and 17% of total sales	sales through two distributors represented 27% and 21% of total sales
Concentration Risk, Product	Sales of three products represented 51%, 17%, and 11% of total sales	Sales of one product represented 73% of total sales	Sales of two products represented 57% and 12% of total sales	Sales of one product represented 70% of total sales
Shandong YCT
Concentration Risk, Supplier	37%	24%	34%	21%
Other Vendor 1
Concentration Risk, Supplier	32%	41%	31%	22%
Other Vendor 2
Concentration Risk, Supplier	16%	28%	20%	15%