Note 1 - Organization and Significant Accounting Policies (Tables)
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12 Months Ended |
Dec. 31, 2025 |
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| Notes Tables |
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| Schedule of Cash and Cash Equivalents [Table Text Block] |
| | | December 31, 2025 | | | December 31, 2024 | |
| Cash | | $ | 9,318 | | | $ | 7,879 | |
| Cash equivalents | | | 2,621 | | | | 631 | |
| Total cash and cash equivalents shown in the Consolidated Statements of Cash Flows | | $ | 11,939 | | | $ | 8,510 | |
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| Debt Securities, Held-to-Maturity [Table Text Block] |
| | | December 31, | |
| | | 2025 | | | 2024 | |
| Held-to-maturity debt securities: | | | | | | | | |
| Amortized cost | | $ | 19,933 | | | $ | 21,059 | |
| Gross unrecognized gains | | | 76 | | | | 50 | |
| Gross unrecognized losses | | | — | | | | (33 | ) |
| Fair value | | $ | 20,009 | | | $ | 21,076 | |
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| Investments Classified by Contractual Maturity Date [Table Text Block] |
| | | Amortized Cost | | | Fair Value | |
| Within one year | | $ | 12,942 | | | $ | 12,981 | |
| After one year through two years | | | 6,005 | | | | 6,028 | |
| After two years through three years | | | 986 | | | | 1,000 | |
| Total | | $ | 19,933 | | | $ | 20,009 | |
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| Financing Receivable, Allowance for Credit Loss [Table Text Block] |
| Year | | Balance at January 1 | | | Provision charged to expense | | | Write-offs / Recoveries | | | Balance at December 31 | |
| 2024 | | $ | 111 | | | $ | — | | | $ | (5 | ) | | $ | 106 | |
| 2025 | | $ | 106 | | | $ | — | | | $ | 2 | | | $ | 108 | |
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| Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
| | | December 31, | |
| | | 2025 | | | 2024 | |
| Foreign currency translation | | | | | | | | |
| Balance at beginning of period | | $ | (1,915 | ) | | $ | (1,748 | ) |
| Other comprehensive loss: | | | | | | | | |
| Foreign currency translation adjustments (1) | | | 197 | | | | (167 | ) |
| Balance at end of period | | $ | (1,718 | ) | | $ | (1,915 | ) |
| Total accumulated other comprehensive loss | | $ | (1,718 | ) | | $ | (1,915 | ) |
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| Schedule of Finite-Lived Intangible Assets [Table Text Block] |
| | | | | | | 2025 | | | 2024 | |
| Description of Other Intangibles | | Amortization Period (years) | | | Gross Carrying Amount | | | Accumulated Amortization | | | Net Carrying Amount | | | Gross Carrying Amount | | | Accumulated Amortization | | | Net Carrying Amount | |
| Patent assets | | | 1 - 20 | | | | 867 | | | | (561 | ) | | | 306 | | | | 852 | | | | (525 | ) | | | 327 | |
| Other intangible assets | | | 10 | | | | 340 | | | | — | | | | 340 | | | | — | | | | — | | | | — | |
| Total | | | | | | $ | 1,207 | | | $ | (561 | ) | | $ | 646 | | | $ | 852 | | | $ | (525 | ) | | $ | 327 | |
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| Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
| Year | | Estimated Amortization Expense | |
| 2026 | | $ | 70 | |
| 2027 | | | 70 | |
| 2028 | | | 70 | |
| 2029 | | | 65 | |
| 2030 | | | 60 | |
| Thereafter | | | 311 | |
| Total | | $ | 646 | |
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| Property, Plant and Equipment [Table Text Block] |
| Description of Property and Equipment | | Depreciable Life (years) | | | 2025 | | | 2024 | |
| Land | | | | | | $ | 1,050 | | | $ | 1,050 | |
| Building | | | 39 | | | | 3,950 | | | | 3,950 | |
| Building and leasehold improvements | | | 3 - 39 | | | | 2,704 | | | | 2,677 | |
| Field equipment | | | 3 - 4 | | | | 13,037 | | | | 13,004 | |
| Computer equipment and software | | | 2 - 3 | | | | 2,057 | | | | 2,017 | |
| Furniture and fixtures | | | 3 - 10 | | | | 1,318 | | | | 1,305 | |
| Vehicles | | | 5 | | | | 37 | | | | 37 | |
| Construction in process | | | | | | | 19 | | | | 2 | |
| Total cost | | | | | | | 24,172 | | | | 24,042 | |
| Less accumulated depreciation | | | | | | | (19,433 | ) | | | (18,958 | ) |
| Total net book value | | | | | | $ | 4,739 | | | $ | 5,084 | |
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| Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
| | | 2025 | | | 2024 | |
| Basic weighted-average shares | | | 30,937,000 | | | | 30,572,000 | |
| Conversion of unsecured loan notes | | | — | | | | — | |
| Unexercised options and unvested restricted stock units | | | — | | | | — | |
| Diluted weighted-average shares | | | 30,937,000 | | | | 30,572,000 | |
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