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Note 3 - Supplemental Balance Sheet Information (in Thousands) - Accounts Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts receivable | $ 46,970 | $ 36,306
Less allowance for doubtful accounts | (533) | (342)
Accounts Receivable, net | 46,142 | 35,964
Trade Accounts Receivable [Member] |  |
Accounts receivable | 34,824 | 29,437
Unbilled [Member] |  |
Accounts receivable | 8,305 | 5,863
Non-Trade [Member] |  |
Accounts receivable | $ 3,546 | $ 1,006

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