Note 6 - Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Finished goods, gross	$ 14,687	$ 13,066
Finished goods, reserve	(2,931)	(2,987)
Finished goods, net	11,756	10,079
Raw materials, gross	6,137	8,324
Raw materials, reserve	(2,184)	(2,695)
Raw materials, net	3,953	5,629
Total inventories, gross	20,824	21,390
Total inventories, reserve	(5,115)	(5,682)
Total inventories, net	15,709	15,708
Current Portion, gross	10,113	9,931
Current Portion, reserve	(1,662)	(1,297)
Inventories	8,451	8,634
Long-term portion, gross	10,711	11,459
Long-term portion, reserve	(3,453)	(4,385)
Inventories, net of current portion	$ 7,258	$ 7,074