Note 3 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Deferred revenue	$ 1,887	$ 2,574
Acquired in business combinations	69	0
Increases due to consideration received from customers	4,007	2,673
Revenue recognized	(1,716)	(3,360)
Deferred revenue	4,247	1,887
Unbilled Receivables - beginning of period	271	72
Increases due to revenue recognized, not invoiced to customers	1,815	3,147
Decreases due to customer invoicing	(2,012)	(2,948)
Unbilled Receivables - end of period	$ 74	$ 271