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Note 2 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Deferred revenue $ 2,507 $ 871
Acquired in Dielectrics business combination 2,175
Increases due to consideration received from customers 991 685
Revenue recognized (526) (601)
Deferred revenue 2,972 $ 3,130
Unbilled Receivables - beginning of period 65  
Decreases due to customer invoicing (106)  
Increases due to revenue recognized - not invoiced to customers 85  
Unbilled Receivables - end of period $ 44