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Note 4 - Accounts Receivable, Net - Accounts Receivable, Net (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts receivable | $ 8,122 | $ 9,752
Allowance for doubtful accounts | (1,373) | (3,393)
Accounts receivable, net | $ 6,749 | $ 6,359

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