Note 2 - Revenue - Net Sales by Product and Service (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net sales	$ 11,861	$ 11,546
Less: sales returns	(32)	(33)
Product [Member]
Net sales	11,048	10,322
Administrative Fees, Freight and Other [Member]
Net sales	$ 845	$ 1,257