Note 7 - Leases - Operating Lease Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating lease cost	$ 511	$ 212	$ 1,173	$ 401
Short-term lease cost	71	3	131	6
Variable lease cost	331	13	624	24
Sublease income	0	(55)	(36)	(109)
Total lease cost	$ 913	$ 173	$ 1,892	$ 322