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Note 3 - Trade Accounts Receivable (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  | 2022 |  |  | 2021 |
|  | (in thousands) |
Billed |  | $ | 119,552 |  |  | $ | 105,992 |
Unbilled |  |  | 20,568 |  |  |  | 20,388 |
Current estimated credit losses |  |  | (5,381 | ) |  |  | (4,526 | )
Total accounts receivable—net |  | $ | 134,739 |  |  | $ | 121,854 |
Financing Receivable, Current, Allowance for Credit Loss [Table Text Block] |
|  | 2022 |  |  | 2021 |  |  | 2020 |
|  | (in thousands) |
Balance—beginning of year |  | $ | 4,526 |  |  | $ | 3,482 |  |  | $ | 2,952 |
Provision for bad debts |  |  | 917 |  |  |  | 1,044 |  |  |  | 530 |
Charge-offs |  |  | (62 | ) |  |  | - |  |  |  | - |
Recoveries |  |  | - |  |  |  | - |  |  |  | - |
Balance—end of year |  | $ | 5,381 |  |  | $ | 4,526 |  |  | $ | 3,482 |

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- Definition Tabular disclosure of allowance for credit loss of financing receivable, classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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