Note 5 - Leases - Leases Cost (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Operating lease costs		$ 729	$ 499
Other		367	121
Total lease costs		1,096	620
Operating cash flows from operating leases		932	312
ROU assets obtained in exchange for new operating lease liabilities	[1]	$ 1,010	$ 2,940
Weighted-average remaining lease term (in years) (Year)		2 years 7 months 6 days		2 years 9 months 18 days
Weighted-average discount rate		2.00%		2.00%

[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).