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Note 2 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Deferred revenue $ 2,507 $ 871
Acquired in Dielectrics business combination 2,175
Increases due to consideration received from customers 2,256 3,088
Revenue recognized (2,231) (2,216)
Deferred revenue 2,532 3,918
Unbilled Receivables - beginning of period 65
Increases due to revenue recognized - not invoiced to customers 660 236
Decreases due to customer invoicing (712) (188)
Unbilled Receivables - end of period $ 13 $ 48