Commitments and Contingencies (Details Narrative) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2003	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Interest income, other		$ 81	$ 36	$ 130	$ 71
Letters of credit outstanding, amount		2,660		2,660
Bond outstanding		8,943		8,943
American International Group, Inc [Member]
Period of finite risk insurance policy	25 years
Maximum allowable coverage of insurance policy		39,000		39,000
Financial assurance coverage amount under insurance policy		29,911		29,911
Sinking fund related to insurance policy		15,807		15,807		$ 15,676
Interest earned on sinking fund		1,255		1,255		$ 1,205
Interest income, other		$ 81	$ 34	$ 131	$ 61
Insurers obligation to entity on termination of contract		100.00%		100.00%