Note 6 - Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Finished goods, gross	$ 16,101	$ 15,337
Finished goods, reserve	(4,175)	(4,129)
Finished goods, net	11,926	11,208
Raw materials, gross	4,617	4,718
Raw materials, reserve	(2,501)	(2,173)
Raw materials, net	2,116	2,545
Total inventories, gross	20,718	20,055
Total inventories, reserve	(6,676)	(6,302)
Total inventories, net	14,042	13,753
Current Portion, gross	10,013	9,399
Current Portion, reserve	(1,169)	(1,115)
Inventories	8,844	8,284
Long-term portion, gross	10,705	10,656
Long-term portion, reserve	(5,507)	(5,187)
Inventories, net of current portion	$ 5,198	$ 5,469