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Note 2 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Deferred revenue $ 1,887 $ 2,574
Increases due to consideration received from customers 560 1,668
Revenue recognized (544) (1,594)
Deferred revenue 1,903 2,648
Unbilled receivables - beginning of period 271 72
Increases due to revenue recognized, not invoiced to customers 935 1,488
Decreases due to customer invoicing (1,008) (1,149)
Unbilled receivables - end of period $ 198 $ 411