Note 7 - Deferred Acquisition Costs - Deferred Acquisition Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Beginning balance, net	$ 9,106	$ 8,750	$ 8,835	$ 8,604
Additions	1,297	1,390	4,335	3,644
Amortization	(1,356)	(1,248)	(4,123)	(3,356)
Balance at September 30, net	$ 9,047	$ 8,892	$ 9,047	$ 8,892