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Note 1 - Organization and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Cash and Cash Equivalents [Table Text Block] |
|  | December 31, 2024 |  |  | December 31, 2023 |
Cash |  | $ | 7,879 |  |  | $ | 12,495 |
Cash equivalents |  |  | 631 |  |  |  | 5,083 |
Total cash and cash equivalents shown in the Consolidated Statements of Cash Flows |  | $ | 8,510 |  |  | $ | 17,578 |
Debt Securities, Held-to-Maturity [Table Text Block] |
|  | December 31, |
|  | 2024 |  |  | 2023 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |
Amortized cost |  | $ | 21,059 |  |  | $ | 15,800 |
Gross unrecognized gains |  |  | 50 |  |  |  | — |
Gross unrecognized losses |  |  | (33 | ) |  |  | (86 | )
Fair value |  | $ | 21,076 |  |  | $ | 15,714 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized Cost |  |  | Fair Value |
Within one year |  | $ | 10,184 |  |  | $ | 10,200 |
After one year through two years |  |  | 10,875 |  |  |  | 10,876 |
Total |  | $ | 21,059 |  |  | $ | 21,076 |
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 |
2023 |  | $ | 110 |  |  | $ | 24 |  |  | $ | (23 | ) |  | $ | 111 |
2024 |  | $ | 111 |  |  | $ | — |  |  | $ | (5 | ) |  | $ | 106 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | December 31, |
|  | 2024 |  |  | 2023 |
Foreign currency translation |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (1,748 | ) |  | $ | (1,728 | )
Other comprehensive loss: |  |  |  |  |  |  |  |
Foreign currency translation adjustments (1) |  |  | (167 | ) |  |  | (20 | )
Balance at end of period |  | $ | (1,915 | ) |  | $ | (1,748 | )
Total accumulated other comprehensive loss |  | $ | (1,915 | ) |  | $ | (1,748 | )
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  |  |  |  |  | 2024 |  |  | 2023 |
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 |  |  |  | 852 |  |  |  | (525 | ) |  |  | 327 |  |  |  | 826 |  |  |  | (468 | ) |  |  | 358 |
Total |  |  |  |  |  | $ | 852 |  |  | $ | (525 | ) |  | $ | 327 |  |  | $ | 826 |  |  | $ | (468 | ) |  | $ | 358 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Year |  | Estimated Amortization Expense |
2025 |  | $ | 36 |
2026 |  |  | 35 |
2027 |  |  | 35 |
2028 |  |  | 35 |
2029 |  |  | 29 |
Thereafter |  |  | 157 |
Total |  | $ | 327 |
Property, Plant and Equipment [Table Text Block] |
Description of Property and Equipment |  | Depreciable Life (years) |  |  | 2024 |  |  | 2023 |
Land |  |  |  |  |  | $ | 1,050 |  |  | $ | 1,050 |
Building |  |  | 39 |  |  |  | 3,950 |  |  |  | 3,950 |
Building and leasehold improvements |  |  | 3 - 39 |  |  |  | 2,677 |  |  |  | 2,655 |
Field equipment |  |  | 3 - 4 |  |  |  | 13,004 |  |  |  | 12,100 |
Computer equipment and software |  |  | 2 - 3 |  |  |  | 2,017 |  |  |  | 2,049 |
Furniture and fixtures |  |  | 3 - 10 |  |  |  | 1,305 |  |  |  | 1,307 |
Vehicles |  |  | 5 |  |  |  | 37 |  |  |  | 32 |
Construction in process |  |  |  |  |  |  | 2 |  |  |  | 99 |
Total cost |  |  |  |  |  |  | 24,042 |  |  |  | 23,242 |
Less accumulated depreciation |  |  |  |  |  |  | (18,958 | ) |  |  | (18,703 | )
Total net book value |  |  |  |  |  | $ | 5,084 |  |  | $ | 4,539 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | 2024 |  |  | 2023 |
Basic weighted-average shares |  |  | 30,572,000 |  |  |  | 30,348,000 |
Conversion of unsecured loan notes |  |  | — |  |  |  | — |
Unexercised options and unvested restricted stock units |  |  | — |  |  |  | — |
Diluted weighted-average shares |  |  | 30,572,000 |  |  |  | 30,348,000 |

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