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v3.22.0.1

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, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 shares
Class of Warrant or Right, Number of Warrants Issued (in shares) | shares |  | 2,850,000 |  |
Proceeds from Issuance of Private Placement |  | $ 25,812 | $ 0 |
Payments of Stock Issuance Costs | $ 1,783 | 1,783 | (0) |
Restricted Cash and Cash Equivalents, Total |  | 1,161 |  |
Restricted Cash and Cash Equivalents, Current, Total |  | 891 | 1,595 |
Restricted Cash and Cash Equivalents, Noncurrent, Total |  | 270 | 371 |
Unbilled Contracts Receivable |  | 1,277 | 2,348 |
Due from Customer Acceptances |  | 55 | 549 |
Inventory, Net, Total |  | $ 348 | 97 |
Number of Reporting Units |  | 2 |  |
Goodwill, Ending Balance |  | $ 2,116 | 2,116 |
Goodwill, Impairment Loss |  | 0 | 0 |
Impairment of Intangible Assets (Excluding Goodwill), Total |  |  | 197 |
Amortization of Intangible Assets, Total |  | 157 | 185 |
Depreciation, Total |  | $ 584 | 663 |
Number of Units with APC Technology |  | 1,200 |  |
Defined Contribution Plan, Cost |  | $ 206 | $ 222 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | shares |  | 434,500 | 484,500 | 747,500
Class of Warrant or Right, Outstanding (in shares) | shares |  | 2,850,000 | 0 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares |  |  | 547,000 |
Treasury Stock, Shares, Acquired (in shares) | shares |  | 15,162 | 152,257 |
Treasury Stock, Value, Acquired, Cost Method |  | $ 52 | $ 570 |
Antidilutive [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | shares |  | 214,500 | 584,505 |
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 |  | 2,603,801 |  |
FUEL CHEM [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Four Customers [Member] |  |  |  |
Number of Major Customers |  | 4 |  |
Concentration Risk, Percentage |  | 60.00% |  |
FUEL CHEM [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member] |  |  |  |
Number of Major Customers |  |  | 2 |
Concentration Risk, Percentage |  |  | 28.00% |
Capitalized Third-party Costs [Member] |  |  |  |
Finite-Lived Patents, Gross |  | $ 52 | $ 0 |
Minimum [Member] |  |  |  |
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] |  |  |  |
Standard Product Warranty Period (Year) |  | 2 years |  |
Maximum [Member] | APC Technology [Member] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month) |  | 18 months |  |
Equipment Contstructed for Resale [Member] |  |  |  |
Inventory, Net, Total |  | $ 227 |  |
Spare Parts [Member] |  |  |  |
Inventory, Net, Total |  | 121 |  |
Chinese Subsidiary [Member] |  |  |  |
Restricted Cash and Cash Equivalents, Total |  | 886 |  |
Italian Subsidiary [Member] |  |  |  |
Cash, Ending Balance |  | 1,391 |  |
Chilean Subsidiary [Member] |  |  |  |
Cash, Ending Balance |  | $ 244 |  |
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 |  | $ 4,746 | $ 3,928 |
Percentage of Revenue |  | 20.00% | 17.00% |

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