Quarterly report pursuant to Section 13 or 15(d)

Other long-term assets (Narrative) (Details)

v3.7.0.1
Other long-term assets (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Future amortization        
2018 $ 71,000   $ 71,000  
2019 71,000   71,000  
2020 71,000   71,000  
2021 71,000   71,000  
2022 71,000   71,000  
Patent impairment charges $ 34,000 $ 168,000