Note 1 - Summary of Significant Accounting Policies - Net Sales by Class of Retailer (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Sales	[1]	$ 425,489	$ 318,790	$ 245,862
Grocery (including Online), Mass and Club [Member]
Net Sales		356,965	272,008	206,550
Pet Specialty and Natural [Member]
Net Sales		$ 68,524	$ 46,782	$ 39,312

[1] Online sales associated with each class of retailer are included within their respective total.