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SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2020
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION |
Schedule of interest and income taxes paid | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Income taxes paid (refunds received) |  | 377 |  | 289 |  | 407
Interest paid |  | 124 |  | 87 |  | 49
Interest received |  | 10 |  | 17 |  | 12
​
​ | ​ | ​ | ​ | ​ | ​ | ​
Non-cash transactions: |  | 2020 |  | 2019 |  | 2018
Financing lease obligations incurred |  | 192 |  | 203 |  | 427
Operating lease obligations incurred |  | 317 |  | 3,483 |  | —
​
​ | ​ | ​
​ |  | 2020
Operating cash flow used in operating leases |  | 941
Operating cash flow used in finance leases |  | 18
Financing cash flow used in finance leases |  | 321

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