Quarterly report pursuant to Section 13 or 15(d)

Significant accounting policies (Narrative) (Details)

v3.5.0.2
Significant accounting policies (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Cash, cash equivalents and short-term investments:          
Cash and cash equivalent investment portfolio, percentage 9.00%   9.00%    
Management fees     $ 17,000 $ 23,000  
Accounts receivable, net $ 21,508   21,508  
Sales $ 1,923 $ 57,089 $ 1,923 $ 92,894  
Income (loss) per share:          
Shares not included in the computation of EPS 1,061,000 776,000 1,061,000 776,000