Note 14 - Concentrations and Credit Risk: Vendor concentrations table (Details)	9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Percent of purchase from Shandong Heze Zhongshun Pharmaceutical - Chinese Medicine	38.10%	34.40%
Percent of purchase from Anguo City Oasis Chinese Herbal Medicines - Chinese Medicine		17.00%
Percent of purchase from Bozhou Weitao Pharmaceutical - Chinese Medicine		22.50%
Percent of purchase from Qufu Longheng Materials - Chinese Medicine	34.90%	12.00%
Percent of purchase from Jiuquan Jiale Biotech - Stevioside	20.00%	23.00%
Percent of purchase from Qingdao Runhao Stevia Technology - Stevioside	13.00%
Percent of purchase from Linyuan City Chengde Stevia Leaves Planting Cooperative - Stevioside		17.00%
Total percent of purchase from major suppliers - Chinese Medicine	73.00%	85.90%
Total percent of purchase from major suppliers - Stevioside	33.00%	40.00%