Note 2 - Revenue - Net Sales by Product and Service (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net sales	$ 11,546	$ 13,469
Less: sales returns	(33)	(116)
Product [Member]
Net sales	10,322	12,031
Administrative Fees, Freight and Other [Member]
Net sales	$ 1,257	$ 1,554