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Note 2 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Deferred revenue $ 2,574 $ 2,507
Increases due to consideration received from customers 2,255 2,256
Revenue recognized (2,883) (2,231)
Deferred revenue 1,946 2,532
Unbilled Receivables - beginning of period 72 65
Increases due to revenue recognized, not invoiced to customers 2,223 660
Decreases due to customer invoicing (2,004) (712)
Unbilled Receivables - end of period $ 291 $ 13