Note 3 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Deferred revenue	$ 4,247	$ 1,887
Increases due to consideration received from customers	3,378	1,869
Revenue recognized	(2,013)	(727)
Deferred revenue	5,612	3,029
Unbilled receivables - beginning of period	74	271
Increases due to revenue recognized, not invoiced to customers	1,937	935
Decreases due to customer invoicing	(1,784)	(1,008)
Unbilled receivables - end of period	$ 227	$ 198