Quarterly report pursuant to Section 13 or 15(d)

Other long-term assets (Schedule of Other Long-Term Assets) (Details)

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Other long-term assets (Schedule of Other Long-Term Assets) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Patents:        
Cost, beginning     $ 509,649  
Cost, ending $ 511,498   511,498  
Additions (15,000) $ (17,000) (29,219) $ (35,000)
Goodwill:        
Goodwill, beginning     1,186,496  
Additions      
Goodwill, ending 1,186,496   1,186,496  
Convertible Note Investment:        
Convertible Note Investment, beginning     200,000  
Additions      
Convertible Note Investment , ending 200,000   200,000  
Total other long-term assets:        
Cost, beginning     2,446,328  
Additions     31,068  
Cost, ending 2,477,396   2,477,396  
Cost, beginning     (550,183)  
Additions     (29,219)  
Cost, ending (579,402)   (579,402)  
Other long-term assets, net, beginning     1,896,145  
Additions     1,849  
Other long-term assets, net, ending 1,897,994   1,897,994  
Patents [Member]        
Patents:        
Cost, beginning     1,059,832  
Additions     31,068  
Cost, ending 1,090,900   1,090,900  
Accumulated amortization, beginning     (550,183)  
Additions     (29,219)  
Accumulated amortization, ending $ (579,402)   $ (579,402)