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Commitments and Contingencies (Details Narrative) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2003 | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2022 CAD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Self-insured retention. |  |  |  | $ 100,000 |  |  |
Accounts receivable, after allowance for credit loss, current |  | $ 12,956,000 |  | 12,956,000 |  |  | $ 11,372,000
Restricted cash, noncurrent |  | 11,511,000 |  | 11,511,000 |  |  | 11,471,000
Interest income |  | 29,000 | $ 2,000 | 40,000 |  | $ 21,000 |
Letters of credit outstanding, amount |  | 3,020,000 |  | 3,020,000 |  |  |
Bond outstanding |  | 53,148,000 |  | 53,148,000 |  |  |
American International Group, Inc [Member] |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Period of finite risk insurance policy | 25 years |  |  |  |  |  |
Maximum allowable coverage of insurance policy |  | 28,177,000 |  | 28,177,000 |  |  |
Coverage amount under the policy |  | 21,175,000 |  | 21,175,000 |  |  |
Interest income |  | $ 29,000 | $ 2,000 | $ 40,000 |  | $ 21,000 |
Insurers obligation to entity on termination of contract |  | 100.00% |  | 100.00% |  |  |
American International Group, Inc [Member] | 2003 Closure Policy [Member] |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Restricted cash, noncurrent |  | $ 11,511,000 |  | $ 11,511,000 |  |  | 11,471,000
Interest income |  |  |  | 2,040,000 |  |  | $ 2,000,000
Canadian Nuclear Laboratories LTD [Member] |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Unpaid receivables and unbilled costs |  |  |  | 2,750,000 |  |  |
Accounts receivable, after allowance for credit loss, current |  | $ 1,115,000 |  | $ 1,115,000 |  |  |
Bond securing amount |  |  |  |  | $ 1,900,000 |  |

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