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Investments (Details 3) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Investment income:    
Gross investment income $ 179 $ 127
Investment expenses (11) (12)
Net investment income 168 115
Fixed Income Securities [Member]    
Investment income:    
Gross investment income 132 100
Cash and Cash Equivalents [Member]    
Investment income:    
Gross investment income $ 47 $ 27