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Note 4 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Deferred revenue - beginning of period $ 6,616 $ 4,679
Unbilled receivables - beginning of period 114 270
Deferred revenue acquired in Welch Fluorocarbon acquisition 8 0
Increases due to revenue recognized, not invoiced to customers 1,620 2,898
Increases due to consideration received from customers 3,302 3,169
Decreases due to customer invoicing (1,532) (3,020)
Revenue recognized (4,128) (4,034)
Unbilled receivables - end of period 202 148
Deferred revenue - end of period $ 5,798 $ 3,814