| Commitments and Contingencies (Details Narrative) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | ||
|---|---|---|---|---|
| Jun. 30, 2003 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | |
| Interest income, other | $ 81 | $ 49 | ||
| Letters of credit outstanding, amount | 2,639 | |||
| Bond outstanding | 18,782 | |||
| American International Group, Inc [Member] | ||||
| Period of finite risk insurance policy | 25 years | |||
| Maximum allowable coverage of insurance policy | 39,000 | |||
| Financial assurance coverage amount under insurance policy | 30,549 | |||
| Sinking fund related to insurance policy | 16,052 | $ 15,971 | ||
| Interest earned on sinking fund | 1,581 | $ 1,500 | ||
| Interest income, other | $ 81 | $ 50 | ||
| Insurers obligation to entity on termination of contract | 100.00% | |||
| X | ||||||||||
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- Definition The total amount of the bonds outstanding as of the reporting date. No definition available. 
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| X | ||||||||||
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- Definition Represents the financial assurance coverage amount under insurance policy. No definition available. 
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| X | ||||||||||
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- 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 | ||||||||||
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- Definition Represents the interest earned on sinking fund. No definition available. 
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| X | ||||||||||
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- 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 | ||||||||||
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- Definition Represents the period of finite risk insurance policy. No definition available. 
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| X | ||||||||||
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- Definition Represents the sinking fund related to the insurance policy. No definition available. 
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| X | ||||||||||
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- Definition Amount of interest income earned from interest bearing assets classified as other. No definition available. 
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| X | ||||||||||
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- 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 | ||||||||||
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- Details 
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