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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

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