Note 5 - Net Sales - Accounts Receivables and Contract Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts receivable - trade	$ 73,551	$ 79,746
Current contract assets	38,234	38,533
Current contract liabilities	$ 17,646	$ 1,821

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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