Note 1 - Nature of the Business and Summary of Significant Accounting Policies - Net Sales by Class of Retailer (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Net Sales	[1]	$ 132,171	$ 93,414
Grocery (including Online), Mass and Club [Member]
Net Sales		115,518	79,071
Pet Specialty and Natural [Member]
Net Sales		$ 16,654	$ 14,342

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