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Note 2 - Allowance for Doubtful Accounts Receivable (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|  | Years Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Balance at the beginning of year |  | $ | 2,964 |  |  | $ | 2,042 |  |  | $ | 1,382 |
Provision for bad debts |  |  | 6,746 |  |  |  | 1,323 |  |  |  | 867 |
Charge-offs |  |  | (2,087 | ) |  |  | (401 | ) |  |  | (210 | )
Recoveries |  |  | 44 |  |  |  | - |  |  |  | 3 |
Balance at the end of year |  | $ | 7,667 |  |  | $ | 2,964 |  |  | $ | 2,042 |

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