Note 1 - Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accumulated Depreciation and Amortization	$ (26,938)	$ (24,979)
Total Property and Equipment, Net	$ 6,513	6,408
Building [Member]
Building (Year)	39 years
Land [Member]
Property and equipment	$ 148	148
Leasehold Improvements [Member] | Minimum [Member]
Building (Year)	3 years
Leasehold Improvements [Member] | Maximum [Member]
Building (Year)	15 years
Building and Leasehold Improvements [Member]
Property and equipment	$ 6,041	5,289
Manufacturing Equipment [Member]
Property and equipment	$ 19,877	19,128
Manufacturing Equipment [Member] | Minimum [Member]
Building (Year)	3 years
Manufacturing Equipment [Member] | Maximum [Member]
Building (Year)	7 years
Office and Other Equipment [Member]
Property and equipment	$ 7,385	$ 6,822
Office and Other Equipment [Member] | Minimum [Member]
Building (Year)	3 years
Office and Other Equipment [Member] | Maximum [Member]
Building (Year)	7 years