Note 7 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating lease cost	$ 882	$ 848
Short-term lease cost	152	112
Sublease income	(74)	(51)
Total lease cost	960	909
Operating cash flows from operating leases	$ 948	$ 901