Note 8 - Leases - Operating Lease Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating lease cost	$ 1,145	$ 959
Short-term lease cost	13	15
Variable lease cost	264	162
Sublease income	(217)	(217)
Total lease cost	$ 1,205	$ 919