Note 1 - Organization and Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Total cost	$ 24,172	$ 24,042
Less accumulated depreciation	(19,433)	(18,958)
Total net book value	4,739	5,084
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	$ 2,704	2,677
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	$ 13,037	13,004
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	$ 2,057	2,017
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	$ 1,318	1,305
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	$ 37	37
Depreciable Life (Year)	5 years
Construction in Progress [Member]
Total cost	$ 19	$ 2