Note 2 - Revenue; Accounts and Unbilled Receivables - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financial services revenue	$ 9,943	$ 12,381	$ 9,943	$ 12,381	$ 35,379	$ 38,747
Financial services revenue, percentage			100.00%	100.00%	100.00%	100.00%
CSB Customers [Member]
Financial services revenue			$ 8,799	$ 12,116	$ 32,708	$ 37,963
Financial services revenue, percentage			88.50%	97.90%	92.50%	98.00%
Non-CSB Customers [Member]
Financial services revenue			$ 1,144	$ 265	$ 2,671	$ 784
Financial services revenue, percentage			11.50%	2.10%	7.50%	2.00%