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		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net Sales	[1]	$ 107,590	$ 84,190	$ 309,620	$ 234,268
Grocery (including Online), Mass and Club [Member]
Net Sales		91,148	71,025	259,227	200,128
Pet Specialty and Natural [Member]
Net Sales		$ 16,442	$ 13,165	$ 50,393	$ 34,139

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