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SIGNIFICANT CUSTOMER INFORMATION (Tables) | 6 Months Ended
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Jun. 30, 2021
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |
Concentration Risk [Line Items] |
Schedules of significant customer information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​
​ |  | 2021 | ​ | ​ | 2020 | ​
Applied Materials, Inc. | ​ | $ | 73,833 |  | 20.4 | % |  | $ | 64,408 |  | 19.0 | %
Lam Research | ​ | $ | 36,317 |  | 10.1 | % | ​ | ​ | * |  | * | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30, | ​
​ |  | 2021 | ​ | ​ | 2020 | ​
Applied Materials, Inc. | ​ | $ | 141,621 |  | 19.9 | % |  | $ | 115,389 |  | 17.6 | %
Lam Research | ​ |  | * |  | * | % | ​ | ​ | * |  | * | %
Accounts Receivable [Member] | Credit Concentration Risk [Member] |
Concentration Risk [Line Items] |
Schedules of significant customer information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, | ​ |  | December 31, | ​
​ | ​ | 2021 | ​ | ​ | 2020 | ​
Applied Materials, Inc. | ​ | $ | 41,397 |  | 17.0 | % |  | $ | 33,402 |  | 14.2 | %
Nidec Motor Corporation | ​ | ​ | * | ​ | * | % |  | $ | 24,344 | ​ | 10.4 | %
​ * Customer’s balance was less than 10% of total.

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