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Note 3 - Supplemental Balance Sheet Information (in Thousands) - Accounts Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts receivable | $ 49,737 | $ 46,675
Less allowance for doubtful accounts | (438) | (533)
Accounts Receivable, net | 49,299 | 46,142
Trade Accounts Receivable [Member] |  |
Accounts receivable | 38,558 | 34,824
Unbilled [Member] |  |
Accounts receivable | 8,423 | 8,305
Non-Trade [Member] |  |
Accounts receivable | $ 2,756 | $ 3,546

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