Note 7 - Leases - Leases Cost (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating lease costs		$ 2,454	$ 1,488	$ 1,509
Other		740	300	465
Total lease costs		3,194	1,788	1,974
Operating cash flows from operating leases		2,315	1,526	1,364
ROU assets obtained in exchange for new operating lease liabilities (1)	[1]	$ 5,195	$ 2,181	$ 3,667
Weighted-average remaining lease term (in years) (Year)		2 years 9 months 18 days	2 years 8 months 12 days
Weighted-average discount rate		2.00%	2.70%

[1] For the year ended December 31, 2019, the amount includes $2.3 million for operating leases existing on January 1, 2019, the adoption date of ASU No. 2016-02, Leases (Topic 842).