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Capital Stock, Stock Plans and Stock-Based Compensation (Details Narrative) - USD ($) |  |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 20, 2023 | Jan. 19, 2023 | Apr. 01, 2019 | Jul. 27, 2017 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock, par value |  |  |  |  | $ 0.001 |  | $ 0.001
Proceeds from stock options exercised |  |  |  |  | $ 150,000 | $ 13,000 |
Common Stock [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of option exercised |  |  |  |  | 244,000 |  |
Number of shares issued from option exercise |  |  |  |  | 163,933 |  |
Common Stock [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock options, exercise price |  |  |  |  | $ 3.60 |  |
Common Stock [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock options, exercise price |  |  |  |  | $ 7.005 |  |
Ferguson Stock Option [Member] | First Milestone [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Options to purchase shares |  |  |  | 10,000 |  |  |
Ferguson Stock Option [Member] | Second Milestone [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Options to purchase shares |  |  |  | 30,000 |  |  |
Ferguson Stock Option [Member] | Third Milestone [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Options to purchase shares |  |  |  | 60,000 |  |  |
Share-Based Payment Arrangement, Option [Member] | Common Stock [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of option exercised |  |  |  |  | 38,400 |  |
Number of stock option purchased |  |  |  |  | 38,400 |  |
Proceeds from stock options exercised |  |  |  |  | $ 150,000 |  |
Share-Based Payment Arrangement, Option [Member] | Common Stock [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock options, exercise price |  |  |  |  | $ 2.785 |  |
Share-Based Payment Arrangement, Option [Member] | Common Stock [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock options, exercise price |  |  |  |  | $ 7.005 |  |
Robert Ferguson [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of option exercised |  |  |  | 10,000 |  |  |
Loans payable |  |  | $ 2,500,000 |  |  |  |
Warrant to purchase |  |  | 60,000 |  |  |  |
Warrants exercise price |  |  | $ 3.51 |  |  |  |
Warrant exercisable, description |  |  | The warrant expires on April 1, 2024 and remains outstanding at September 30, 2023. Upon Mr. Ferguson’s death, the warrant transferred to Mr. Ferguson’s heirs. The Ferguson Loan was paid in full in December 2020. |  |  |  |
Employee and Directors [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation cost related to unvested options consultant |  |  |  |  | $ 1,947,000 |  |
Weighted average term for unrecognized and unvested option to be recognized |  |  |  |  | 3 years 4 months 24 days |  |
2017 Stock Option Plan [Member] | Consultant [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of stock option shares granted |  |  |  | 100,000 |  |  |
Stock options, exercise price |  |  |  | $ 3.65 |  |  |
2003 Outside Directors Stock Plan [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of stock option shares granted | 10,000 |  |  |  |  |  |
Vesting period, description | one-fourth vesting annually over a four-year period. |  |  |  |  |  |
Stock options, exercise price | $ 9.81 |  |  |  |  |  |
2003 Outside Directors Stock Option Plan [Member] | Common Stock [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Issuance of common stock for services, shares |  |  |  |  | 54,202 |  |
Allocated share-based compensation expense |  |  |  |  | $ 359,000 |  |
Incentive Stock Option Agreement [Member] | 2017 Stock Option Plan [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of stock option shares granted |  | 295,000 |  |  |  |  |
Common stock, par value |  | $ 0.001 |  |  |  |  |
Weighted average contractual term (years) outstanding |  | 6 years |  |  |  |  |
Vesting period, description |  | one-fifth yearly vesting over a five-year period. |  |  |  |  |
Stock options, exercise price |  | $ 3.95 |  |  |  |  |
Incentive Stock Option Agreement [Member] | 2017 Stock Option Plan [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of stock option shares granted |  | 70,000 |  |  |  |  |
Incentive Stock Option Agreement [Member] | 2017 Stock Option Plan [Member] | Chief Financial Officer [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of stock option shares granted |  | 40,000 |  |  |  |  |
Incentive Stock Option Agreement [Member] | 2017 Stock Option Plan [Member] | EVP of Strategic Initiatives [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of stock option shares granted |  | 30,000 |  |  |  |  |
Incentive Stock Option Agreement [Member] | 2017 Stock Option Plan [Member] | EVP of Waste Treatment Operations [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of stock option shares granted |  | 30,000 |  |  |  |  |
Incentive Stock Option Agreement [Member] | 2017 Stock Option Plan [Member] | EVP of Nuclear and Technical Services [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of stock option shares granted |  | 30,000 |  |  |  |  |

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