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Note 3 - Supplemental Balance Sheet Information (in Thousands) - Accounts Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Accounts receivable | $ 65,368 | $ 54,735
Less allowance for doubtful accounts | (1,654) | (564)
Accounts receivable, net | 63,714 | 54,171
Trade Accounts Receivable [Member] |  |
Accounts receivable | 53,658 | 44,424
Unbilled [Member] |  |
Accounts receivable | 10,436 | 8,168
Non-Trade [Member] |  |
Accounts receivable | $ 1,274 | $ 2,143

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