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Schedule II - Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Summary of Allowance for Doubtful Accounts and Revenue Adjustments [Table Text Block] |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Balance at beginning of year |  | $ | 486 |  |  | $ | 564 |  |  | $ | 652 |
Provision for (reversal of) bad debt |  |  | 13 |  |  |  | (52 | ) |  |  | (50 | )
Write-offs, net of recoveries |  |  | (15 | ) |  |  | (26 | ) |  |  | (38 | )
Balance at end of year |  | $ | 484 |  |  | $ | 486 |  |  | $ | 564 |

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