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Note 2 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Deferred revenue $ 2,574 $ 2,507
Increases due to consideration received from customers 525 991
Revenue recognized (667) (526)
Deferred revenue 2,432 2,972
Unbilled Receivables - beginning of period 72 65
Increases due to revenue recognized - not invoiced to customers 522 85
Decreases due to customer invoicing (404) (106)
Unbilled Receivables - end of period $ 190 $ 44