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Note 2 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Deferred revenue $ 2,574 $ 2,507
Increases due to consideration received from customers 1,668 1,541
Revenue recognized (1,594) (1,097)
Deferred revenue 2,648 2,951
Unbilled Receivables - beginning of period 72 65
Increases due to revenue recognized, not invoiced to customers 1,488 280
Decreases due to customer invoicing (1,149) (314)
Unbilled Receivables - end of period $ 411 $ 31