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Note 3 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Deferred revenue $ 4,247 $ 1,887
Increases due to consideration received from customers 1,116 441
Revenue recognized (323) (374)
Deferred revenue 5,040 1,954
Unbilled Receivables - beginning of period 74 271
Increases due to revenue recognized, not invoiced to customers 740 531
Decreases due to customer invoicing (412) (578)
Unbilled Receivables - end of period $ 402 $ 224