Note 5 - Inventories - Inventories (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Raw materials	$ 12,220,000	$ 13,018,000
Work in process	3,013,000	2,225,000
Finished goods	8,861,000	9,154,000
Inventory, Net	$ 24,094,000	$ 24,397,000	[1]

[1] The condensed consolidated balance sheet as of December 31, 2022, has been prepared using information from the audited consolidated balance sheet as of that date.