Commitments and Contingencies (Details Narrative) - USD ($) $ in Thousands  | 
1 Months Ended | 3 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2003  | 
Mar. 31, 2020  | 
Mar. 31, 2019  | 
Dec. 31, 2019  | 
|
| Finite risk sinking fund (restricted cash) | $ 11,363 | $ 11,307 | ||
| Interest income, other | 56 | $ 81 | ||
| Letters of credit outstanding, amount | 3,139 | |||
| Bond outstanding | 51,538 | |||
| American International Group, Inc [Member] | ||||
| Period of finite risk insurance policy | 25 years | |||
| Maximum allowable coverage of insurance policy | $ 28,177 | |||
| Coverage amount under the policy | 19,651 | |||
| Interest earned on sinking fund | 1,892 | $ 1,836 | ||
| Interest income, other | $ 56 | $ 81 | ||
| Insurers obligation to entity on termination of contract | 100.00% | |||
| X | ||||||||||
- Definition The total amount of the bonds outstanding as of the reporting date. No definition available. 
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| X | ||||||||||
- Definition Coverage amount under the policy. No definition available. 
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| X | ||||||||||
- Definition As of the balance sheet date, the total amount into the sinking fund, along with interest income earned, in connection for the company's closure policies. No definition available. 
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| X | ||||||||||
- Definition Insurer's obligation to entity on termination of contract in terms of percentage of sinking fund. No definition available. 
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| X | ||||||||||
- Definition Represents the interest earned on sinking fund. No definition available. 
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| X | ||||||||||
- Definition Maximum allowable coverage of insurance policy against annual inflation and other performance and surety bond requirements. No definition available. 
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| X | ||||||||||
- Definition Represents the period of finite risk insurance policy. No definition available. 
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| X | ||||||||||
- Definition Amount of interest income earned from interest bearing assets classified as other. No definition available. 
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| X | ||||||||||
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. No definition available. 
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| X | ||||||||||
- Details 
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