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Other long-term assets (Schedule of Other Long-Term Assets) (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Patents: |  |
Cost, beginning | $ 509,649 |
Cost, ending | 519,113 |
Additions | (14,610) | $ (18,000)
Goodwill: |  |
Goodwill, beginning | 1,186,496 |
Additions |  |
Goodwill, ending | 1,186,496 |
Convertible Note Investment: |  |
Convertible Note Investment, beginning | 200,000 |
Convertible Note Investment , ending | 200,000 |
Total other long-term assets: |  |
Cost, beginning | 2,446,328 |
Additions | 24,074 |
Cost, ending | 2,470,402 |
Additions | (52,974) |
Other long-term assets, net, beginning | 1,896,145 |
Additions | 9,464 |
Other long-term assets, net, ending | 1,905,609 |
Patents [Member] |  |
Patents: |  |
Cost, beginning | 1,059,832 |
Additions | 24,074 |
Cost, ending | 1,083,906 |
Accumulated amortization, beginning | (550,183) |
Additions | (14,610) |
Accumulated amortization, ending | $ (564,793) |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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