Note 5 - Accounts Receivable and Revenues (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

	Customer
	A			B
% of revenue, three months ended March 31, 2022		11	%		11	%
% of revenue, three months ended March 31, 2021		5	%		10	%
% of accounts receivable, as of March 31, 2022		4	%		18	%
% of accounts receivable, as of December 31, 2021		15	%		8	%

Disaggregation of Revenue [Table Text Block]

	Three Months Ended March 31,
	2022		2021
United States	$	10,246	$	8,196
Other countries		313		409
Revenues	$	10,559	$	8,605