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Commitments and Contingencies (Details Narrative) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2003 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Self-insured retention |  |  |  | $ 100,000 |  |
Accounts receivable, after allowance for credit loss, current |  | $ 15,342,000 |  | 15,342,000 |  | $ 9,364,000
Restricted cash, noncurrent |  | 11,926,000 |  | 11,926,000 |  | 11,570,000
Interest income |  | 146,000 | $ 29,000 | 445,000 | $ 69,000 |
Letters of credit outstanding, amount |  | 3,200,000 |  | 3,200,000 |  |
Bond outstanding |  | 36,428,000 |  | 36,428,000 |  |
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 |  | 22,461,000 |  | 22,461,000 |  |
Interest income |  | $ 146,000 | $ 29,000 | $ 356,000 | $ 69,000 |
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 |  | $ 11,926,000 |  | $ 11,926,000 |  | 11,570,000
Interest income |  |  |  | 2,455,000 |  | $ 2,099,000
Canadian Nuclear Laboratories LTD [Member] |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Unpaid receivables |  | 2,287,000 |  | 2,287,000 |  |
Accounts receivable, after allowance for credit loss, current |  | $ 1,056,000 |  | $ 1,056,000 |  |

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