Note 2 - Basis of Presentation and Summary of Significant Accounting Policies - Sales From Natural and Organic Retail Stores (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Sales percentage	100.00%	100.00%	100.00%	100.00%
Grocery [Member]
Sales percentage	67.00%	68.00%	68.00%	68.00%
Dietary Supplements [Member]
Sales percentage	23.00%	22.00%	22.00%	21.00%
Other [Member]
Sales percentage	10.00%	10.00%	10.00%	11.00%