Annual report pursuant to Section 13 and 15(d)

Organization and summary of significant accounting policies (Income (loss) per share) (Details)

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Organization and summary of significant accounting policies (Income (loss) per share) (Details) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income (loss) per share:    
Shares not included in the computation of EPS 1,093,750 764,563