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Investments (Details 3) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Investment income:        
Gross investment income $ 298 $ 139 $ 477 $ 266
Investment expenses (14) (12) (25) (24)
Net investment income 284 127 452 242
Fixed Income Securities [Member]        
Investment income:        
Gross investment income 185 109 317 209
Cash and Cash Equivalents [Member]        
Investment income:        
Gross investment income 49 28 96 55
Realized Gain Upon Sale of Securities [Member]        
Investment income:        
Gross investment income $ 64   $ 64  
Other [Member]        
Investment income:        
Gross investment income   $ 2   $ 2