Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details Narrative)

v3.23.2
Commitments and Contingencies (Details Narrative)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2003
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2023
CAD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Self-insured retention       $ 100,000      
Accounts receivable, after allowance for credit loss, current   $ 11,930,000   11,930,000   $ 9,364,000  
Restricted cash, noncurrent   11,780,000   11,780,000   11,570,000  
Interest income   172,000 $ 29,000 298,000 $ 40,000    
Letters of credit outstanding, amount   3,200,000   3,200,000      
Bond outstanding   31,870,000   31,870,000      
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   $ 143,000 $ 29,000 $ 210,000 $ 40,000    
Insurers obligation to entity on termination of contract   100.00%   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   $ 11,780,000   $ 11,780,000   11,570,000  
Interest income       2,309,000   $ 2,099,000  
Canadian Nuclear Laboratories LTD [Member]              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Unpaid receivables   1,895,000   1,895,000      
Accounts receivable, after allowance for credit loss, current   $ 1,084,000   $ 1,084,000      
Bond securing amount             $ 1,900,000