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Note 4 - Net Sales - Accounts Receivables and Contract Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts receivable - trade | $ 75,597 | $ 64,017
Current contract assets | 38,030 | 49,236
Current contract liabilities | $ 1,372 | $ 437

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