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Note 1 - Organization and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Cash and Cash Equivalents [Table Text Block] |
|  | December 31, 2022 |  |  | December 31, 2021 |
Cash |  | $ | 12,560 |  |  | $ | 35,893 |
Cash equivalents |  |  | 10,768 |  |  |  | — |
Restricted cash included in current assets |  |  | — |  |  |  | 891 |
Restricted cash included in long-term assets |  |  | — |  |  |  | 270 |
Total cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows |  | $ | 23,328 |  |  | $ | 37,054 |
Debt Securities, Held-to-Maturity [Table Text Block] |
Held-to-maturity debt securities: |  |  |  |
Amortized cost |  | $ | 9,341 |
Gross unrecognized gains |  |  | — |
Gross unrecognized losses |  |  | (168 | )
Fair value |  | $ | 9,173 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized Cost |  |  | Fair Value |
Within one year |  | $ | 2,981 |  |  | $ | 2,957 |
After one year through two years |  |  | 4,919 |  |  |  | 4,807 |
After two years through three years |  |  | 1,441 |  |  |  | 1,409 |
Total |  | $ | 9,341 |  |  | $ | 9,173 |
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 |
2021 |  | $ | 835 |  |  | $ | 227 |  |  | $ | (839 | ) |  | $ | 223 |
2022 |  | $ | 223 |  |  | $ | (19 | ) |  | $ | (94 | ) |  | $ | 110 |
Schedule of Excess and Obsolete Inventory Reserve [Table Text Block] |
Year |  | Balance at January 1 |  |  | Provision charged to expense |  |  | Write-offs / Recoveries |  |  | Balance at December 31 |
2021 |  | $ | 907 |  |  | $ | — |  |  | $ | 20 |  |  | $ | 927 |
2022 |  | $ | 927 |  |  | $ | — |  |  | $ | — |  |  | $ | 927 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | December 31, |
|  | 2022 |  |  | 2021 |
Foreign currency translation |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (1,604 | ) |  | $ | (1,370 | )
Other comprehensive loss: |  |  |  |  |  |  |  |
Foreign currency translation adjustments (1) |  |  | (124 | ) |  |  | (234 | )
Balance at end of period |  | $ | (1,728 | ) |  | $ | (1,604 | )
Total accumulated other comprehensive loss |  | $ | (1,728 | ) |  | $ | (1,604 | )
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  |  |  |  |  | 2022 |  |  | 2021 |
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 |  |  |  | 803 |  |  |  | (406 | ) |  |  | 397 |  |  |  | 789 |  |  |  | (341 | ) |  |  | 448 |
Total |  |  |  |  |  | $ | 803 |  |  | $ | (406 | ) |  | $ | 397 |  |  | $ | 789 |  |  | $ | (341 | ) |  | $ | 448 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Year |  | Estimated Amortization Expense |
2023 |  | $ | 60 |
2024 |  |  | 52 |
2025 |  |  | 31 |
2026 |  |  | 31 |
2027 |  |  | 31 |
Thereafter |  |  | 192 |
Total |  | $ | 397 |
Property, Plant and Equipment [Table Text Block] |
Description of Property and Equipment |  | Depreciable Life (years) |  |  | 2022 |  |  | 2021 |
Land |  |  |  |  |  | $ | 1,050 |  |  | $ | 1,050 |
Building |  |  | 39 |  |  |  | 3,950 |  |  |  | 3,950 |
Building and leasehold improvements |  |  | 3 - 39 |  |  |  | 2,626 |  |  |  | 2,626 |
Field equipment |  |  | 3 - 4 |  |  |  | 11,882 |  |  |  | 11,787 |
Computer equipment and software |  |  | 2 - 3 |  |  |  | 2,117 |  |  |  | 2,099 |
Furniture and fixtures |  |  | 3 - 10 |  |  |  | 1,306 |  |  |  | 1,308 |
Vehicles |  |  | 5 |  |  |  | 32 |  |  |  | 32 |
Construction in process |  |  |  |  |  |  | 29 |  |  |  | — |
Total cost |  |  |  |  |  |  | 22,992 |  |  |  | 22,852 |
Less accumulated depreciation |  |  |  |  |  |  | (18,557 | ) |  |  | (18,243 | )
Total net book value |  |  |  |  |  | $ | 4,435 |  |  | $ | 4,609 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | 2022 |  |  | 2021 |
Basic weighted-average shares |  |  | 30,289,000 |  |  |  | 29,585,000 |
Conversion of unsecured loan notes |  |  | — |  |  |  | — |
Unexercised options and unvested restricted stock units |  |  | — |  |  |  | 109,000 |
Diluted weighted-average shares |  |  | 30,289,000 |  |  |  | 29,694,000 |

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