Note 2 - Revenue; Accounts and Unbilled Receivables (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Nine Months Ended September 30, 2021				Three Months Ended September 30, 2021				Nine Months Ended September 30, 2020				Three Months Ended September 30, 2020
Type of Customer
CSB	$	32,708	92.5	%	$	8,799	88.5	%	$	37,963	98.0	%	$	12,116	97.9	%
Other		2,671	7.5	%		1,144	11.5	%		784	2.0	%		265	2.1	%
Total	$	35,379	100.0	%	$	9,943	100.0	%	$	38,747	100.0	%	$	12,381	100.0	%

Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]

	September 30, 2021 (unaudited)			December 31, 2020
Accounts receivable	$	2,312		$	2,705
Unbilled receivables (Contract Assets)		1,214			2,303
Allowance for doubtful accounts		(10	)		—
Total	$	3,516		$	5,008