Note 1 - Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Accumulated Depreciation and Amortization	$ (24,224)	$ (29,582)
Total Property and Equipment, Net	5,833	6,426
Land [Member]
Property and equipment	$ 148	176
Building [Member]
Estimated useful lives (Year)	39 years
Leasehold Improvements [Member] \| Minimum [Member]
Estimated useful lives (Year)	3 years
Leasehold Improvements [Member] \| Maximum [Member]
Estimated useful lives (Year)	15 years
Building and Leasehold Improvements [Member]
Property and equipment	$ 4,083	5,999
Manufacturing Equipment [Member]
Property and equipment	$ 18,892	22,685
Manufacturing Equipment [Member] \| Minimum [Member]
Estimated useful lives (Year)	3 years
Manufacturing Equipment [Member] \| Maximum [Member]
Estimated useful lives (Year)	7 years
Office and Other Equipment [Member]
Property and equipment	$ 6,934	$ 7,148
Office and Other Equipment [Member] \| Minimum [Member]
Estimated useful lives (Year)	3 years
Office and Other Equipment [Member] \| Maximum [Member]
Estimated useful lives (Year)	7 years

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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