Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net sales	$ 265,110	$ 224,411	$ 772,664	$ 676,373
Grocery [Member]
Net sales	190,114	154,383	534,220	463,486
Dietary Supplements [Member]
Net sales	49,355	46,240	161,225	141,724
Manufactured Product, Other [Member]
Net sales	$ 25,641	$ 23,788	$ 77,219	$ 71,163