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v3.23.2

Capital Stock, Stock Plans and Stock Based Compensation (Details Narrative) - USD ($) |  |  |  |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 19, 2023 | Dec. 31, 2022 | Apr. 01, 2019 | Jul. 27, 2017 | May 31, 2018 | Jun. 30, 2023 | Jun. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Proceeds from stock options exercised |  |  |  |  |  | $ 101,000 |
Common Stock [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Issuance of common stock upon exercise of options (cashless), shares |  |  |  |  |  | 163,255 |
Number of stock option purchased |  |  |  |  |  | 242,000 |
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 |  |  |  |  |  | $ 3.65 |
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] |  |  |  |  |  |  |
Issuance of common stock upon exercise of options (cashless), shares |  |  |  |  |  | 23,600 |
Number of stock option purchased |  |  |  |  |  | 23,600 |
Proceeds from stock options exercised |  |  |  |  |  | $ 101,000 |
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] |  |  |  |  |  |  |
Issuance of common stock upon exercise of options (cashless), shares |  |  |  |  | 10,000 |  |
Number of shares forfeited |  | 30,000 |  |  |  |  |
Remaining stock option |  | 60,000 |  |  |  |  |
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 June 30, 2023. Upon Mr. Ferguson’s death, the warrant is now held by Mr. Ferguson’s personal representative and/or beneficiary. 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 |  |  |  |  |  | $ 1,644,000 |
Weighted average term for unrecognized and unvested option to be recognized |  |  |  |  |  | 3 years 7 months 6 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 Option Plan [Member] | Common Stock [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Issuance of common stock for services, shares |  |  |  |  |  | 43,490 |
Allocated share-based compensation expense |  |  |  |  |  | $ 237,000 |
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 |  |  |  |  |  |
Weighted average contractual term (years) outstanding | 6 years |  |  |  |  |  |
Vesting, 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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