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CAPITAL STOCK, STOCK PLANS, WARRANTS AND STOCK BASED COMPENSATION (Details Narrative) - USD ($) |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 12, 2023 | Oct. 19, 2023 | Jul. 20, 2023 | Jan. 19, 2023 | Jul. 21, 2022 | Jul. 20, 2021 | Jul. 27, 2017 | Dec. 31, 2023 | Dec. 31, 2022 | Apr. 01, 2019
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option term |  |  |  |  |  | 10 |  |  |  |
Option granted to director upon re-election |  |  |  |  |  |  |  | 370,000 |  |
Proceeds from stock options exercised |  |  |  |  |  |  |  | $ 269,000 | $ 13,000 |
Income tax benefit |  |  |  |  |  |  |  | $ 17,000 | $ (378,000) |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of option exercised |  |  |  |  |  |  |  | 225,949 | 18,926 |
Stock issued during period for services, shares |  |  |  |  |  |  |  | 65,854 | 90,920 |
Number of common shares reserved for future issuance |  |  |  |  |  |  |  | 994,500 |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Income tax benefits associated with stock-based compensation expense |  |  |  |  |  |  |  | $ 45,000 | $ 23,000 |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock options, exercise price |  |  |  |  |  |  |  |  | $ 3.97 |
Number of shares issued from option exercise |  |  |  |  |  |  |  | 185,549 | 16,526 |
Number of option exercised |  |  |  |  |  |  |  | 280,000 | 50,000 |
Common Stock [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock options, exercise price |  |  |  |  |  |  |  |  | $ 5.50 |
Number of shares issued from option exercise |  |  |  |  |  |  |  | 40,400 | 2,400 |
Number of stock option purchased |  |  |  |  |  |  |  | 40,400 | 2,400 |
Proceeds from stock options exercised |  |  |  |  |  |  |  | $ 164,000 | $ 13,000 |
Income tax benefit |  |  |  |  |  |  |  | $ 25,000,000 | $ 3,000,000 |
Maximum [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock options, exercise price |  |  |  |  |  |  |  | $ 7.005 |  |
Maximum [Member] | Common Stock [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock options, exercise price |  |  |  |  |  |  |  | 7.005 |  |
Minimum [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock options, exercise price |  |  |  |  |  |  |  | 3.60 |  |
Minimum [Member] | Common Stock [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock options, exercise price |  |  |  |  |  |  |  | $ 2.785 |  |
First Milestone [Member] | Ferguson Stock Option [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Options to purchase shares |  |  |  |  |  |  | 10,000 |  |  |
Second Milestone [Member] | Ferguson Stock Option [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Options to purchase shares |  |  |  |  |  |  | 30,000 |  |  |
Third Milestone [Member] | Ferguson Stock Option [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Options to purchase shares |  |  |  |  |  |  | 60,000 |  |  |
Employee and Directors [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to unvested options consultant |  |  |  |  |  |  |  | $ 1,809,000 |  |
Weighted average term for unrecognized and unvested option to be recognized |  |  |  |  |  |  |  | 3 years 2 months 12 days |  |
Robert Ferguson [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Loans payable |  |  |  |  |  |  |  |  |  | $ 2,500,000
Warrants exercise price |  |  |  |  |  |  |  |  |  | $ 3.51
Warrant maturity date |  |  |  |  |  |  |  | Apr. 01, 2024 |  |
Robert Ferguson [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Warrant to purchase |  |  |  |  |  |  |  |  |  | 60,000
Robert Ferguson Heir One [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Warrant to purchase |  |  |  |  |  |  |  |  |  | 30,000
Robert Ferguson Heir Two [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Warrant to purchase |  |  |  |  |  |  |  |  |  | 30,000
Robert Ferguson Heir [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Warrant to purchase | 30,000 |  |  |  |  |  |  |  |  |
Proceeds from warrant exercised | $ 105,000 |  |  |  |  |  |  |  |  |
2003 Stock Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 6 months |  |  |  |
Vesting percentage |  |  |  |  |  | 25.00% |  |  |  |
2003 Stock Plan [Member] | Director [Member] | Reelection [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option granted to outside director upon re-election |  |  |  |  |  | 10,000 |  |  |  |
2003 Stock Plan [Member] | Director [Member] | Initial Election [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option granted to director upon initial election |  |  |  |  |  | 20,000 |  |  |  |
2003 Outside Directors Stock Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of directors fees, description |  |  |  |  |  |  |  | the 2003 Plan provides for the issuance to each Eligible Director a number of shares of the Company’s Common Stock in lieu of 65% or 100% (based on option elected by each director) of the fee payable to the Eligible Director for services rendered as a member of the Board. The number of shares issued is determined at 75% of the market value as defined in the plan (the Company recognizes 100% of the market value of the shares issued). |  |
Shares remaining available for issuance |  |  |  |  |  |  |  | 318,680 |  |
Option granted to director upon re-election |  |  | 10,000 |  |  |  |  |  |  |
Weighted average contractual term (years) outstanding |  |  | 10 years |  |  |  |  |  |  |
Vesting period |  |  | one-fourth vesting annually over a four-year period |  |  |  |  |  |  |
Stock options, exercise price |  |  | $ 9.81 |  |  |  |  |  |  |
2017 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares remaining available for issuance |  |  |  |  |  |  |  | 720,500 |  |
Stock option granted, description |  |  |  |  |  |  |  | The term of each stock option granted under the 2017 Plan shall be fixed by the Compensation and Stock Option Committee (the “Compensation Committee”), but no stock options will be exercisable more than ten years after the grant date, or in the case of an ISO granted to a 10% stockholder, five years after the grant date. The exercise price of any ISO granted under the 2017 Plan to an individual who is not a 10% stockholder at the time of the grant shall not be less than the fair market value of the shares at the time of the grant, and the exercise price of any ISO granted to a 10% stockholder shall not be less than 110% of the fair market value at the time of grant. |  |
2017 Stock Option Plan [Member] | Incentive Stock Option Agreement [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option granted to director upon re-election |  | 5,000 |  | 295,000 |  |  |  |  |  |
Weighted average contractual term (years) outstanding |  | 6 years |  | 6 years |  |  |  |  |  |
Vesting period |  | one-fifth vesting annually over a five-year period |  | one-fifth yearly vesting over a five-year period. |  |  |  |  |  |
Stock options, exercise price |  | $ 9.62 |  | $ 3.95 |  |  |  |  |  |
2017 Stock Option Plan [Member] | Officers and Employees [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance |  |  |  |  |  |  |  | 1,740,000 |  |
Number of shares additional for issuance |  |  |  |  |  |  |  | 600,000 |  |
2017 Stock Option Plan [Member] | Chief Executive Officer [Member] | Incentive Stock Option Agreement [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option granted to director upon re-election |  |  |  | 70,000 |  |  |  |  |  |
2017 Stock Option Plan [Member] | Chief Financial Officer [Member] | Incentive Stock Option Agreement [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option granted to director upon re-election |  |  |  | 40,000 |  |  |  |  |  |
2017 Stock Option Plan [Member] | EVP of Strategic Initiatives [Member] | Incentive Stock Option Agreement [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option granted to director upon re-election |  |  |  | 30,000 |  |  |  |  |  |
2017 Stock Option Plan [Member] | EVP of Waste Treatment Operations [Member] | Incentive Stock Option Agreement [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option granted to director upon re-election |  |  |  | 30,000 |  |  |  |  |  |
2017 Stock Option Plan [Member] | EVP of Nuclear and Technical Services [Member] | Incentive Stock Option Agreement [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option granted to director upon re-election |  |  |  | 30,000 |  |  |  |  |  |
2017 Stock Option Plan [Member] | Consultant [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option granted to director upon re-election |  |  |  |  |  |  | 100,000 |  |  |
Stock options, exercise price |  |  |  |  |  |  | $ 3.65 |  |  |
2003 Stock Option Plan [Member] | Dr. Louis Centofanti [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option granted to director upon re-election |  |  |  |  | 10,000 |  |  |  |  |
Vesting period |  |  |  |  | one-fourth vesting annually over a four-year period |  |  |  |  |
Stock options, exercise price |  |  |  |  | $ 5.15 |  |  |  |  |
Expected contractual term |  |  |  |  | 10 years |  |  |  |  |
2017 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option granted to director upon re-election |  |  |  |  | 24,000 |  |  |  |  |
Vesting period |  |  |  |  | one-fifth vesting annually over a five-year period |  |  |  |  |
Stock options, exercise price |  |  |  |  | $ 5.34 |  |  |  |  |
Expected contractual term |  |  |  |  | 6 years |  |  |  |  |
2003 Outside Directors Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of directors fees, description |  |  |  |  |  |  |  | As a member of the Board, each director elects to receive either 65% or 100% of the director’s fee in shares of our Common Stock. The number of shares received is calculated based on 75% of the fair market value of our Common Stock determined on the business day immediately preceding the date that the quarterly fee is due. |  |
2003 Outside Directors Stock Option Plan [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued during period for services, shares |  |  |  |  |  |  |  | 65,854 | 90,920 |
2003 Outside Directors Stock Plan [Member] | Portion of Director Fee Earned in Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Allocated share-based compensation expense |  |  |  |  |  |  |  | $ 477,000 | $ 477,000 |

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