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Note 3 - Trade Accounts Receivable | 12 Months Ended
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Dec. 31, 2021
Notes to Financial Statements |
Financing Receivables [Text Block] | 3. TRADE ACCOUNTS RECEIVABLE The Company's receivables result primarily from the sale of transportation and logistics services. The Company performs ongoing credit evaluations of its customers and generally does not require collateral for accounts receivable. Accounts receivable, which consist of both billed and unbilled receivables, are presented net of current estimated credit losses. Accounts outstanding longer than contractual payment terms are considered past due and are reviewed individually for collectability. Accounts receivable balances consist of the following components as of December 31, 2021 and 2020:
|  | 2021 |  |  | 2020 |
|  | (in thousands) |
Billed |  | $ | 105,992 |  |  | $ | 68,584 |
Unbilled |  |  | 20,388 |  |  |  | 12,629 |
Current estimated credit losses |  |  | (4,526 | ) |  |  | (3,482 | )
Total accounts receivable—net |  | $ | 121,854 |  |  | $ | 77,731 |
An analysis of changes in current estimated credit losses for the years ended December 31, 2021, 2020, and 2019 follows:
|  | 2021 |  |  | 2020 |  |  | 2019 |
|  | (in thousands) |
Balance—beginning of year |  | $ | 3,482 |  |  | $ | 2,952 |  |  | $ | 2,224 |
Provision for bad debts |  |  | 1,044 |  |  |  | 530 |  |  |  | 728 |
Charge-offs |  |  | - |  |  |  | - |  |  |  | - |
Recoveries |  |  | - |  |  |  | - |  |  |  | - |
Balance—end of year |  | $ | 4,526 |  |  | $ | 3,482 |  |  | $ | 2,952 |

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- Definition The entire disclosure for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2196816 + Details
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