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Note 1 - Organization and Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Total cost	$ 22,992	$ 22,852
Less accumulated depreciation	(18,557)	(18,243)
Total net book value	4,435	4,609
Land [Member]
Total cost	1,050	1,050
Building [Member]
Total cost	$ 3,950	3,950
Depreciable Life (Year)	39 years
Building and Leasehold Improvements [Member]
Total cost	$ 2,626	2,626
Building and Leasehold Improvements [Member] | Minimum [Member]
Depreciable Life (Year)	3 years
Building and Leasehold Improvements [Member] | Maximum [Member]
Depreciable Life (Year)	39 years
Field Equipment [Member]
Total cost	$ 11,882	11,787
Field Equipment [Member] | Minimum [Member]
Depreciable Life (Year)	3 years
Field Equipment [Member] | Maximum [Member]
Depreciable Life (Year)	4 years
Computer Equipment and Software [Member]
Total cost	$ 2,117	2,099
Computer Equipment and Software [Member] | Minimum [Member]
Depreciable Life (Year)	2 years
Computer Equipment and Software [Member] | Maximum [Member]
Depreciable Life (Year)	3 years
Furniture and Fixtures [Member]
Total cost	$ 1,306	1,308
Furniture and Fixtures [Member] | Minimum [Member]
Depreciable Life (Year)	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Depreciable Life (Year)	10 years
Vehicles [Member]
Total cost	$ 32	32
Depreciable Life (Year)	5 years
Construction in Progress [Member]
Total cost	$ 29	$ 0

X

- Definition

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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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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