Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Net sales	$ 271,822	$ 259,198	$ 549,110	$ 524,243
Net Sales, percent	100.00%	100.00%	100.00%	100.00%
Grocery [Member]
Net sales	$ 188,814	$ 180,457	$ 380,843	$ 366,072
Net Sales, percent	70.00%	70.00%	69.00%	70.00%
Dietary Supplements [Member]
Net sales	$ 58,135	$ 53,901	$ 116,207	$ 107,125
Net Sales, percent	21.00%	21.00%	21.00%	20.00%
Manufactured Product, Other [Member]
Net sales	$ 24,873	$ 24,840	$ 52,060	$ 51,046
Net Sales, percent	9.00%	9.00%	10.00%	10.00%