Note 14 - Concentrations (Details Textual)	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019	Dec. 31, 2018
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number Of Distributors	1	1	1
Number of Major Customers	0	1	0
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Distributor [Member]
Concentration Risk, Percentage	18.00%	17.00%	16.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number Of Distributors	1	1
Number of Major Customers	2	2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One[Member]
Concentration Risk, Percentage	8.00%	19.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member]
Concentration Risk, Percentage	23.00%	19.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Three [Member]
Concentration Risk, Percentage	20.00%	14.00%
Supplier Concentration Risk [Member] | Cost of Goods and Service, Product and Service Benchmark [Member] | Raw Materials [Member]
Concentration Risk, Percentage	23.00%	27.00%	17.00%
Number of Vendors	1	1	1
Supplier Concentration Risk [Member] | Cost of Goods and Service, Product and Service Benchmark [Member] | Packaging Materials [Member]
Concentration Risk, Percentage	88.00%	80.00%	81.00%
Number of Vendors	5	3	3
Maximum [Member]
Cash, FDIC Insured Amount	$ 250,000