Note 6 - Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Finished goods, gross	$ 13,053	$ 13,066
Finished goods, reserve	(3,521)	(2,987)
Finished goods, net	9,532	10,079
Raw materials, gross	5,491	8,324
Raw materials, reserve	(2,547)	(2,695)
Raw materials, net	2,944	5,629
Total inventories, gross	18,544	21,390
Total inventories, reserve	(6,068)	(5,682)
Total inventories, net	12,476	15,708
Current Portion, gross	9,990	9,931
Current Portion, reserve	(955)	(1,297)
Inventories	9,035	8,634
Long-term portion, gross	8,554	11,459
Long-term portion, reserve	(5,113)	(4,385)
Inventories, net of current portion	$ 3,441	$ 7,074