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4. Line of Credit (Details Narrative) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Revolving line of credit, maximum principal amount $ 40,000  
Line of credit $ 0 $ 0
Revolving line of credit, interest plus LIBOR [1] 1.76%  
[1] LIBOR plus one percent