Note 5 - Inventories - Inventories (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Raw materials	$ 10,012,000	$ 10,470,000
Work in process	2,425,000	2,236,000
Finished goods	8,332,000	7,425,000
Inventory, Net	$ 20,769,000	$ 20,131,000	[1]

[1] The condensed consolidated balance sheet as of December 31, 2023, has been prepared using information from the audited consolidated balance sheet as of that date.