Note 5 - Major Customer and Vendor (Details)	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Number Of Major Distributors	The Company sold products through ten distributors	The Company sold products through ten distributors
Concentration Risk, Other Risk	Sales to three distributors represented 23%, 16%, and 14% of total sales	Sales to three distributors represented 32%, 25%, and 12% of total sales
Concentration Risk, Product	Sales of three products represented 53%, 15% and 14% of total sales	Sales of one product represented 69% of total sales
Shandong YCT
Concentration Risk, Supplier	33%	25%
Other Vendor 1
Concentration Risk, Supplier	23%, 18%,	39%
Other Vendor 2
Concentration Risk, Supplier	14%	23%