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Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fixed income securities:    
Amortized Cost $ 40,272 $ 26,793
Gross Unrealized Gains 135 40
Gross Unrealized Losses (204) (274)
Estimated Fair Value 40,203 26,559
Equity Securities    
Amortized Cost Basis 1,182 1,000
Gross Unrealized Gains 117 136
Gross Unrealized Losses (41)  
Estimated Fair Value 1,258 1,136
Total Securities    
Amortized Cost 41,454 27,793
Gross Unrealized Gains 252 176
Gross Unrealized Losses (245) (274)
Estimated Fair Value 41,461 27,695
Common Stock [Member]    
Equity Securities    
Amortized Cost Basis 1,118 1,000
Gross Unrealized Gains 26 136
Gross Unrealized Losses (36)  
Estimated Fair Value 1,108 1,136
Warrants to Purchase Common Stock [Member]    
Equity Securities    
Amortized Cost Basis 35  
Gross Unrealized Gains 90  
Gross Unrealized Losses (2)  
Estimated Fair Value 123  
Rights to Purchase Common Stock [Member]    
Equity Securities    
Amortized Cost Basis 29  
Gross Unrealized Gains 1  
Gross Unrealized Losses (3)  
Estimated Fair Value 27  
U.S. government [Member]    
Fixed income securities:    
Amortized Cost 1,997 1,623
Gross Unrealized Gains 7 1
Gross Unrealized Losses (14) (20)
Estimated Fair Value 1,990 1,604
States, Municipalities and Political Subdivisions [Member]    
Fixed income securities:    
Amortized Cost 4,776 2,271
Gross Unrealized Gains 18 2
Gross Unrealized Losses (26) (27)
Estimated Fair Value 4,768 2,246
Asset-backed Securities and Collateralized Mortgage Backed Obligations [Member]    
Fixed income securities:    
Amortized Cost 15,133 12,095
Gross Unrealized Gains 25 9
Gross Unrealized Losses (116) (136)
Estimated Fair Value 15,042 11,968
Corporate [Member]    
Fixed income securities:    
Amortized Cost 18,366 10,804
Gross Unrealized Gains 85 28
Gross Unrealized Losses (48) (91)
Estimated Fair Value $ 18,403 $ 10,741