Quarterly report pursuant to Section 13 or 15(d)

Other long-term assets (Narrative) (Details)

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Other long-term assets (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]          
Amortization expense of intangible assets $ 14,000 $ 53,000 $ 43,828 $ 53,000  
1172767 B.C. Ltd. [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Intangible assets acquired in business acquisition $ 754,000   $ 754,000   $ 1,986,000