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Inventories | 3 Months Ended
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Mar. 31, 2018
Inventories [Text Block] |
4. | Inventories
Inventories as of December 31, 2017 and March 31, 2018 consisted of the following:
|  |  | December 31, |  |  | March 31, |
|  |  | 2017 |  |  | 2018 |
| Raw materials | $ | 1,814,704 |  | $ | 2,547,462 |
| Work in progress |  | 2,188,193 |  |  | 2,453,321 |
| Finished goods |  | 5,829,508 |  |  | 6,604,625 |
|  | $ | 9,832,405 |  | $ | 11,605,408 |
During the three months ended March 31, 2017 and 2018, write-downs of obsolete inventories to lower of cost or market of $150,156 and $1,199, 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
Name: | us-gaap_InventoryDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration