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v3.25.0.1

Note 1 - Organization and Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 shares
Cash | $ 7,879 | $ 12,495 |
Investment Plan, Maximum Amount. Approved | 20,000 |  |
Unbilled Contracts Receivable | 2,075 | 2,285 |
Inventory, Net | 397 | 439 |
Inventory Valuation Reserves | $ 613 | 613 |
Number of Reporting Units | 2 |  |
Goodwill | $ 2,116 | 2,116 |
Goodwill, Impairment Loss | 0 | 0 |
Amortization of Intangible Assets | 57 | 61 |
Depreciation | 403 | 281 |
Asset Impairment Charges | 0 | 0 |
Defined Contribution Plan, Cost | $ 249 | $ 233 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | shares | 176,000 | 270,500 | 384,500
Class of Warrant or Right, Outstanding (in shares) | shares | 2,850,000 | 2,850,000 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares | 274,900 | 246,500 |
Treasury Stock, Shares, Acquired (in shares) | shares | 83,050 | 0 |
Treasury Stock, Value, Acquired, Cost Method | $ 95 |  |
Employee Retention Credit Receivable | $ 1,677 | $ 0 |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member] |  |  |
Number of Major Customers | 2 | 2 |
Concentration Risk, Percentage | 27.00% | 36.00% |
Antidilutive [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | shares | 168,900 | 390,900 |
Class of Warrant or Right, Outstanding (in shares) | shares | 2,850,000 | 2,850,000 |
The 2014 Long-term Incentive Plan [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | shares | 0 |  |
Incentive Plans [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | shares | 2,957,150 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | shares | 4,215,272 |  |
Capitalized Third-party Costs [Member] |  |  |
Finite-Lived Patents, Gross | $ 26 | $ 28 |
FUEL CHEM Technology Segment [Member] |  |  |
Goodwill | $ 2,116 | $ 2,116 |
FUEL CHEM Technology Segment [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member] |  |  |
Number of Major Customers | 2 | 2 |
Equipment Constructed for Resale [Member] |  |  |
Inventory, Net | $ 176 | $ 207 |
Spare Parts [Member] |  |  |
Inventory, Net | 221 | 232 |
In Process Equipment [Member] |  |  |
Inventory, Net | $ 44 | 618 |
Minimum [Member] |  |  |
Debt Securities, Held-to-maturity, Maturity Term (Month) | 3 months |  |
Standard Product Warranty Period (Year) | 1 year |  |
Minimum [Member] | APC Technology [Member] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month) | 6 months |  |
Maximum [Member] |  |  |
Debt Securities, Held-to-maturity, Maturity Term (Month) | 36 months |  |
Standard Product Warranty Period (Year) | 2 years |  |
Maximum [Member] | APC Technology [Member] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month) | 18 months |  |
Asset Pledged as Collateral [Member] | Letter of Credit [Member] |  |  |
Restricted Cash and Investments | $ 2,790 |  |
Asset Pledged as Collateral [Member] | Letter of Credit [Member] | Varying Maturity Dates Expiring No Later Than June 30, 2026 [Member] |  |  |
Restricted Cash and Investments | 1,860 |  |
Non-US [Member] |  |  |
Revenues | $ 7,331 | $ 5,684 |
Percentage of Revenue | 29.00% | 21.00% |
CHINA |  |  |
Cash | $ 548 |  |
ITALY |  |  |
Cash | 1,176 |  |
CHILE |  |  |
Cash | $ 159 |  |

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