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Inventories | 6 Months Ended
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Jun. 30, 2018
Inventories [Text Block] |
4. | Inventories
Inventories as of December 31, 2017 and June 30, 2018 consisted of the following:
|  | December 31, |  |  | June 30, |
|  | 2017 |  |  | 2018 |
Raw materials | $ | 1,814,704 |  | $ | 1,826,433 |
Work in progress |  | 2,188,193 |  |  | 1,634,652 |
Finished goods |  | 5,829,508 |  |  | 7,229,883 |
| $ | 9,832,405 |  | $ | 10,690,968 |
During the three months ended June 30, 2017 and 2018, write-downs of obsolete inventories to lower of cost or market of $848,247 and $nil, respectively, were charged to cost of revenues. During the six months ended June 30, 2017 and 2018, write-downs of obsolete inventories to lower of cost or market of $998,403 and $1,999, respectively, were charged to cost of revenues.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration