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Note 1 - Organization and Significant Accounting Policies (Details Textual) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 11, 2021 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) shares | Jun. 30, 2022 USD ($) | Dec. 31, 2020 shares
Class of Warrant or Right, Number of Warrants Issued (in shares) | shares |  | 0 |  |  |
Proceeds from Issuance of Private Placement |  | $ 0 | $ 25,812 |  |
Payments of Stock Issuance Costs | $ 1,783 | (0) | 1,783 |  |
Cash |  | 12,560 | 35,893 |  |
Investment Plan, Maximum Amount. Approved |  |  |  | $ 10,000 |
Investment Plan, Maximum Additional Amount, Approved |  | 10,000 |  |  |
Unbilled Contracts Receivable |  | 3,082 | 1,277 |  |
Due from Customer Acceptances |  | 0 | 55 |  |
Inventory, Net, Total |  | $ 392 | 348 |  |
Number of Reporting Units |  | 2 |  |  |
Goodwill, Ending Balance |  | $ 2,116 | 2,116 |  |
Goodwill, Impairment Loss |  | 0 | 0 |  |
Amortization of Intangible Assets |  | 88 | 157 |  |
Depreciation, Total |  | $ 352 | 584 |  |
Number of Units with APC Technology |  | 1,200 |  |  |
Defined Contribution Plan, Cost |  | $ 200 | $ 206 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | shares |  | 384,500 | 434,500 |  | 484,500
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 |  | 42,600 |  |  |
Treasury Stock, Shares, Acquired (in shares) | shares |  | 12,497 | 15,162 |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 17 | $ 52 |  |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Three Customers [Member] |  |  |  |  |
Number of Major Customers |  | 3 |  |  |
Concentration Risk, Percentage |  | 48.00% |  |  |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Four Customers [Member] |  |  |  |  |
Number of Major Customers |  |  | 4 |  |
Concentration Risk, Percentage |  |  | 60.00% |  |
Antidilutive [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | shares |  | 763,800 | 214,500 |  |
Class of Warrant or Right, Outstanding (in shares) | shares |  | 2,850,000 |  |  |
The 2014 Long-term Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | shares |  | 5,600,676 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | shares |  | 1,899,250 |  |  |
Capitalized Third-party Costs [Member] |  |  |  |  |
Finite-Lived Patents, Gross |  | $ 37 | $ 52 |  |
FUEL CHEM Technology Segment [Member] |  |  |  |  |
Goodwill, Ending Balance |  | $ 2,116 | $ 2,116 |  |
APC Technology [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |  |  |  |
Number of Major Customers |  | 1 | 1 |  |
Equipment Contstructed for Resale [Member] |  |  |  |  |
Inventory, Net, Total |  | $ 207 | $ 227 |  |
Spare Parts [Member] |  |  |  |  |
Inventory, Net, Total |  | 185 | 121 |  |
In Process Equipment [Member] |  |  |  |  |
Inventory, Net, Total |  | $ 634 | 627 |  |
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, Total |  | $ 1,034 |  |  |
Warrants Issued in Connection with Private Placement [Member] |  |  |  |  |
Class of Warrant or Right, Number of Warrants Issued (in shares) | shares | 2,500,000 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | 2,500,000 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 5.10 | $ 5.10 |  |  |
Warrants and Rights Outstanding, Term (Year) | 5 years 6 months |  |  |  |
Class of Warrant or Right, Outstanding (in shares) | shares |  | 2,500,000 |  |  |
The Placement Agent Warrants [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | 350,000 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 6.45 | $ 6.45 |  |  |
Warrants and Rights Outstanding, Term (Year) | 5 years 6 months |  |  |  |
Class of Warrant or Right, Outstanding (in shares) | shares |  | 350,000 |  |  |
Private Placement [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares | 5,000,000 |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares | $ 5.1625 |  |  |  |
Proceeds from Issuance of Private Placement | $ 25,812 |  |  |  |
Payments of Stock Issuance Costs | $ 1,783 |  |  |  |
Private Placement [Member] | Warrants Issued in Connection with Private Placement [Member] |  |  |  |  |
Class of Warrant or Right, Number of Warrants Issued (in shares) | shares | 2,500,000 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | 2,500,000 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 5.10 |  |  |  |
Non-US [Member] |  |  |  |  |
Revenues, Total |  | $ 6,630 | $ 4,746 |  |
Percentage of Revenue |  | 25.00% | 20.00% |  |
CHINA |  |  |  |  |
Cash |  | $ 675 |  |  |
ITALY |  |  |  |  |
Cash |  | 300 |  |  |
CHILE |  |  |  |  |
Cash |  | $ 225 |  |  |

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